CN101920032B - Athermal plasma purifying unit - Google Patents
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- CN101920032B CN101920032B CN 200910113651 CN200910113651A CN101920032B CN 101920032 B CN101920032 B CN 101920032B CN 200910113651 CN200910113651 CN 200910113651 CN 200910113651 A CN200910113651 A CN 200910113651A CN 101920032 B CN101920032 B CN 101920032B
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Abstract
The invention relates to an athermal plasma purifying unit, belonging to the technical field of air sterilization and purification. The athermal plasma purifying unit comprises a plasma reactor, a pulse power source, a fan assembly, an air inlet, an air outlet, a power source coupler and an outer case. A positive electrode comprising a plurality of nickel-chromium metal wires or metal straps is arranged in the reactor, and both ends of the positive electrode are fixed in corresponding grooves or protrusions on a conductor rail for preventing micro discharge. The pulse power source is provided with a digital control circuit, an oscillator, an error amplifier and a PWM (Pulse-Width Modulation) comparator are arranged in the digital control circuit, and the operating current of the plasma reactor is converted into a digital control current to control the width of an output pulse. The invention effectively stops the micro discharge phenomenon of the reactor and prolongs service life, and the high-voltage pulse current can increase the concentration of the plasma, can improve air sterilization and purification efficiency and can save energy. The athermal plasma purifying unit can be widely applied to places having high requirements for cleanness, such as factory clean rooms, hospital operating rooms, isolation wards and the like, and can also be applied to the air sterilization and purification of places such as office buildings, theatres, trains, automobiles, subways and the like.
Description
Technical field:
The invention belongs to technical field of air sterilization and purification, be specifically related to Athermal plasma purifying unit.
Background technology:
It is several that the common air disinfection and purification unit that is used for toilets such as semiconductor factory, pharmaceutical factory, food factory and hospital operating room mainly contains Filtration Adsorption type, electronics electrostatic adsorption type, ozonization type, disinfection by ultraviolet light type, light catalytic purifying etc. on the market.
The Filtration Adsorption type is the air disinfection and purification unit that present thumping majority toilet selects for use, and common have high efficiency particle air filter, a FFU.It utilizes the Van der Waals force that exists between body surface, and the suspended particulate contaminants in the absorbed air purifies air.It can only the filtering dust, can not thorough disinfection; Filtration resistance increases and increases with the dust granules thing, and dust containing capacity reduces, and purification efficiency descends thereupon.If untimely cleaning or replacing can cause secondary pollution; Its air drag is big, energy consumption is also big; It is also big certainly to drive fan noise.
The electronics electrostatic adsorption type, is separated particulate matter by the effect of Coulomb force by the static discharge of electrode from air-flow, reach the purpose that purifies air.It is effective that it removes dust, but bactericidal effect is poor, can not remove harmful gass such as formaldehyde.
The ozonization type is to utilize the unstable characteristic of ozone and strong oxidation sterilizing.Ozone is a kind of strong oxidizer, should not place inflammable, that explosion hazard gases directly contacts arranged, can not control of dust.In a single day ozone leak, and the human respiratory tract is damaged.
Microorganisms such as the ultraviolet kill bacteria of disinfection by ultraviolet light type employing wavelength 253.7nm, virus.It is invalid that it removes dust; Ultraviolet belongs to black light, leaks easily, can damage human eye, skin.
Light catalytic purifying is photocatalyst TiO
2Under the irradiation of the ultraviolet light of 387.5nm wavelength, make air molecule produce the hole with strong oxidability, i.e. surface hydroxylation, its energy is equivalent to the high temperature of 15000K, direct kill bacteria, decomposing organic matter is CO
2And H
2Nontoxic inorganic matter such as O.Its shortcoming is that light-catalyzed reaction is the restriction that is subjected to intensity of illumination, air mass flow, TiO
2The deactivation phenomenom of self is the basic reason that light catalytic purifying efficient reduces; And the ultraviolet of illumination leaks the same injury problem that exists human body skin, eyes easily.
In view of the limitation of the single purification of clean unit of above-mentioned toilet, thus two or more unit combination of selecting for use that have form, to compensate its defect.This just makes, and air disinfection and purification cellular construction complexity, volume increase, the cost height, use also inconvenient.
Summary of the invention:
The objective of the invention is provides a kind of good reliability, long working life, generation plasma density height in order to solve above-mentioned the deficiencies in the prior art, improves air disinfection and purification efficient; And simple in structure, energy-conservation Athermal plasma purifying unit again.
Athermal plasma purifying unit of the present invention is to produce corona discharge by plasma reactor under the high-voltage pulse power source effect, drives the room air sterilizing and purifying that repeatedly circulates by fan assembly again.The key of design Athermal plasma purifying unit is reactor and two core components of high-voltage pulse power source of matching thereof.The preferred plan test shows: it is to make corona discharge around electrode that the reactor sparking electrode of Athermal plasma purifying unit is selected nickel chromium triangle tinsel or nickel chromium triangle metal tape for use, and the plasma uniformity of generation and intensity are best; The discharge current ascensional range of pulse power output is more steep, and the plasma density of generation is more high, and side effect such as the ozone that produces, nitrogen oxide are also few, the efficient height, and the present invention is as preferential.
Sterilizing and purifying principle of the present invention is: pre-charged control of dust is to utilize plasma reactor to make corona discharge under the driving of high-voltage pulse power source, produce Athermal plasma, the a large amount of electronics that wherein comprise and negative ions are under the effect of electric-force gradient, with airborne microgranule generation inelastic collision, thereby above being attached to, make it to become charged particle.Under the effect of extra electric field power, charged particle moves to dust collecting electrode, finally is deposited on the dust collecting electrode.Its processing procedure is divided into three phases:
1. e+M (gas molecule) → M
-
2. M
-+ PM (microgranule) → (PMM);
3. (PMM)
-→ PMM (being deposited on the dust collecting electrode).
Electrostatic precipitation is a physical process, in this process, to being suspended in diameter in the air less than the total suspended particles (TSP) of 100 μ m and diameter the sucked granule (PM less than 10 μ m
10) the certain removing effect of generation.
Catalytic purification in the non-thermal plasma reactor of the present invention is based on high energy electron and gas molecule collision reaction.Its catalytic purification mechanism comprises two steps: the one, and in the process that produces plasma, high-frequency discharge produces the moment high-energy, opens the chemical bond of some harmful gas molecule, makes it resolve into simple substance atom or harmless molecule.The 2nd, the free radical that comprises a large amount of high energy electrons, ion, excited state particle in the plasma and have strong oxidizing property, the average energy of these active particles is higher than the bond energy of gas molecule, collision frequently takes place in they and harmful gas molecule, open the chemical bond of gas molecule, also can produce a large amount of OH, HO simultaneously
2, free radical and the extremely strong O of oxidisability such as O
3, they and harmful gas molecule generation chemical reaction generate harmless product.The oxidizing potential of living radical OH (2.8eV) also exceeds 35%, OH free radical than the oxidizing potential (2.07eV) of ozone and organic response speed exceeds several magnitude.It is as follows that the present invention is oxidized to carbon dioxide and water or mineral Analysis on action mechanism with the harmful substance in the contaminated air:
H
2S+·OH→HS+H
2O
HS+O
2+·OH+·O→SO
3+H
2O
NH
3+·OH→NH
2+H
2O
NH
2+O
2+·O→NO
2+H
2O
Actual measurement shows, the most of nuisance mass-energy in the contaminated air between very short in oxidized decomposition, degradation rate is more than 95%.
Generally speaking, organic degraded is the plasma chemical reaction process of a complexity under the corona discharge effect of the present invention, because the time compole that free radical exists is short, response speed is also quite fast, determine specifically that some courses of reaction are very difficult.Though the research of existing a large amount of Athermal plasma degradation of contaminant mechanism does not at present also form the theoretical system that can instruct practice, thereby the mechanism of further investigation Athermal plasma degradation of contaminant is one of applied research direction.
Through investigating and analysing: present most producers are used for the reactor discharge positive pole of air sterillization dare not use tinsel again, be because often work less than three, four months with regard to fracture of wire, have no way out and use zigzag and tip-like discharge positive pole instead, it is low to be forced to the plasma density accepting to produce, side effect such as the ozone that produces, nitrogen oxide are the fact how also, well imagine so it can only be used for the electronics electrostatic adsorption type.For example: the Chinese invention patent application number is 200710038821.4, and denomination of invention " assembly modular type systyle electrostatic field device " description homepage just proposes: " the fine rule defective of broken string has easily greatly influenced the reliability of installing.”
The technical staff who has is in order to solve the Insulation Problems between the plasma reactor positive and negative electrode, selects for use insulant to make directly fixing plasma reactor anelectrode wiry of support.Studies show that through inventor's repetition test: the insulant that dielectric constant is high is beneficial to the positive and negative electrode of isolating high potential, and deadly defect is will produce the micro discharge phenomenon in plasma reactor; Next is to increase along with the working time, the electric leakage that cause with the accumulation of atmospheric humidity, dust on its surface, climbs arc.The material that dielectric constant is more high, its surperficial micro discharge phenomenon more.In order to promote the sterilizing and purifying effect, often improve the additional power source voltage of plasma reactor, be the highfield that forms around the anelectrode, under the catalytic action of plasma, cause the local micro discharge that produces of anelectrode tinsel and insulant contact area.The high energy electron that this micro discharge phenomenon produces plays direct effect to ionization and the disassociation of insulant and metallic conduction material molecule, and catabolite is their oxide and water.The root place that the discharge anelectrode of Here it is plasma reactor selects for use fine wire to be blown easily.
The inventor is with same specification high-voltage pulse power source, specially to thread, zigzag and tip-like do non-thermal plasma reactor that electric anelectrode makes in closed chamber continuously energising oppose than test.Work only fortnight, zigzag and tip-like reactor operating current obviously descend; Fracture of wire appears in six week of fadenreaction device work.But all reactor bottoms all flow has expired atrous mucus; All there is the creepage vestige of yellow black on insulant surface between the positive and negative electrode, and the sign that is corroded also appears in the positive electrode surface in this district.It is also similar to have added the phenomenon that the reactor of hairspring takes place between insulating support and tinsel anelectrode, and the fracture of wire time only postponed about two, three months.This is that otherwise tinsel is broken easily or spring is inoperative because spring does not allow too slightly.Even this spring rustless steel is made and also is unable to escape the misfortune that is etched because of micro discharge.
Another key is exactly that high voltage power supply is for the plasma reactor matching problem that is capacitive load.Test shows: under atmospheric pressure want to make reactor to make corona discharge generation high concentration plasma and should possess two conditions to improve its sterilization and purification efficient.At first be that plus high-voltage field only applies energy to airborne electronics, heat, accelerate in moment (nS level), obtain kinetic energy, make the very little electron temperature of quality up to more than 10,000 degree, and other particle acquisition is extremely low-yield.Another condition is: extra electric field applies time (uS level) of energy to electronics will be much smaller than the time that does not apply energy to electronics, and the energy that gas is obtained can in time conduct, and prevents from carrying out the transition to hot plasma and lower efficiency.This just requires plasma electrical source not only to provide 10---and outside the dc high-voltage of 20KV, also high dutycycle must be arranged, it is the high-frequency narrow-pulse current of 120nS at least that the rise time reaches.Consider that simultaneously plasma reactor is capacitive load, generally be equivalent to hundreds of to the capacitance of thousands of uuF.The positive and negative electrode long-term work is again unavoidably by accidental short circuit, and all these safeties for plasma electrical source, the harshness of stability requirement are well imagined.In view of turn-on and turn-off time of present semiconductor power switch device is the uS level, adopt conventional method for designing: for example semi-bridge inversion, multi-harmonic-oscillations, intermittent oscillation or voltage multiplying rectifier are difficult to satisfy above-mentioned two conditions.The high pressure resistant high-power switch device of nS level is expensive, and working life is short, and design is unpractical at the product for civilian use.
Majority has been selected simple, inexpensive DC high-voltage power supply for use on the market.As everyone knows, the active space of the plasma that dc corona discharge forms is little, only limits near the corona discharge.Know from experience breakdown and the formation spark discharge when DC voltage is higher than reactor positive and negative electrode marginal value seasonal epidemic pathogens, gas temperature is raise, efficient is low, energy consumption is greatly apparent; Also a large amount of ozone can appear.For the AC-DC overlaying power of plasma reactor, high-frequency and high-voltage alternating current of stack is realized on the high voltage direct current basis by many producers adopt in the world.It forces down than the corona discharge peak electricity of dc source, and voltage range is wide, but decreases slightly in the burst pulse corona discharge method, so the quantity of active particle and active space all fall between.It neither be desirable as the coupling power supply of plasma reactor.
The anelectrode of prior art ionic medium precursor reactant device select for use fine wire to be blown easily basic reason---the micro discharge effect is not found, also indeterminate to its reason physically, thereby also just can not find the technical scheme that solve to stop the micro discharge effect.Everyly implementing the manufacturer that plasma reactor discharge anelectrode is selected the air disinfection purifier of zigzag or prong shape structure for use, majority was made tinsel as the plasma reactor of anelectrode in the past.Just have no way out because of " fracture of wire " exactly and make the electrostatic adsorption type air disinfection purifier of prong shape, zigzag electrode into.Would rather sacrifice the sterilizing and purifying effect, with reliability and the working life that exchanges disinfection purifier for.Abandoning the fine wire anelectrode and selecting the technical scheme of zigzag or tip-like discharge electrode for use is a kind of prejudice.Add not matching of high-voltage DC power supply, cause that present plasma air disinfection purifier poor reliability, working life are short, the air disinfection and purification inefficiency, it apply that to be restricted also be among the reason.Particularly plasma reactor making clean unit is not seen in the air disinfection and purification unit of toilets such as quasiconductor, pharmacy, food factory and hospital operating room.
In order to achieve the above object, technical scheme of the present invention is:
Athermal plasma purifying unit comprises plasma reactor, the pulse power, fan assembly, air inlet, air outlet, power coupling and shell.Air inlet, air outlet are provided with air filter, and plasma reactor is arranged among the air-flow.Be provided with in the designed plasma reactor some nickel chromium triangle tinsels or nickel chromium triangle metal tape in same plane by the equidistant anelectrode that is arranged in parallel and makes, anelectrode places adjacent two negative electrode middle parts; The two ends of anelectrode are to be fixed on to stop on the micro discharge conductor rail in corresponding groove or the protuberance, and the two ends that stop the micro discharge conductor rail are fixed with four anelectrode metal racks that quadrature is arranged on around the reactor again, and make electric connection; The upper/lower terminal of every anelectrode metal rack is established an insulation junctional complex installing hole corresponding with shell of reactor and is fixed; The upper/lower terminal of described negative electrode is directly to be fixed on the metal shell of reactor, and makes electric connection.Be provided with in the pulse power of design and plasma reactor coupling EMC wave filter, rectification circuit, filter circuit, digital control circuit, pulse generator, pulse transformer successively order be electrically connected the external plasma reactor of the outfan of pulse transformer; Described pulse generator outfan is provided with current detection circuit, detected pulse generator output current signal is sent into agitator, error amplifier and PWM comparator in the digital control circuit, convert the input that exports pulse generator behind the digital control electric current to; Agitator, error amplifier and PWM comparator in the described digital control circuit can be arranged in the IC 1.End a1 of the same name, the a2 of the primary coil of pulse transformer and secondary coil and different name end b1, b2 oppositely arrange; Secondary coil is that to turn to by section be that two line bags are in series at least, and the upper end of each line bag respectively is provided with a high pressure fast recovery diode.Be provided with semiconductor switch pipe Q1 in the pulse generator, drain electrode meets the end a1 of the same name of primary coil, grid is connected by interior IC 1 outfan of resistor R4 and digital control circuit, source electrode meets the resistor R5 in the current detection circuit, and the semiconductor switch pipe Q1 in pulse transformer and the pulse generator is the setting of inverse-excitation type inverter.
Plasma air disinfection purifier technical scheme two of the present invention preferentially, described prevention micro discharge conductor rail is to be made by aluminium bar or stainless steel strip, and the two ends of the anelectrode that some nickel chromium triangle tinsels or nickel chromium triangle metal tape are made are fixed in the groove that stops correspondence position on the micro discharge conductor rail or the protuberance and are located.The nickel chromium triangle wire diameter optimum of anelectrode is 0.20mm, or nickel chromium triangle metal tape optimum width is 2mm, and thickness is 0.08---0.10mm.
Plasma air disinfection purifier technical scheme three of the present invention preferentially, described pulse transformer is provided with a multiple-grooved insulated coil skeleton, and secondary coil is that three sections to five sections of branches are wound in the corresponding groove of multiple-grooved insulated coil skeleton and are in series; Be provided with the iron-base ultramicro-crystal iron core in the endoporus of described primary coil and secondary coil and make electromagnetic coupled, be provided with magnetic air gap in the magnetic loop of iron-base ultramicro-crystal iron core.Described magnetic core optimal design iron-base ultramicro-crystal iron core also can arrange ferrite core.
Plasma air disinfection purifier technical scheme four of the present invention preferentially is provided with the silent ventilator of jagged edge fan blade in the described fan assembly, the sawtooth height is 8mm, and interdental space is 12mm.
Plasma air disinfection purifier technical scheme five of the present invention preferentially; the output earth potential termination of described pulse transformer has abnormal state protection circuit; the outfan of abnormal state protection circuit is connected with the digital control circuit input; signal code after operating current sampling, the photoelectricity that pulse transformer is delivered to plasma reactor is isolated is sent into the digital control circuit input; control electric current after digital processing is delivered to the pulse generator input from the digital control circuit outfan, controls output pulse width automatically.The two ends of pulse transformer primary coil are provided with the pulse amplitude limiter circuit, the output voltage peak clamping at pulse transformer primary coil two ends.
Plasma air disinfection purifier technical scheme six of the present invention preferentially, described EMC wave filter are provided with differential mode inductance device LI and common-mode inductor L2 series connection, each capacitor in parallel of EMC filter input end and outfan.
The present invention compared with prior art has following beneficial effect:
The present invention adopts above-mentioned Athermal plasma purifying unit carry out indoor air disinfectionization, is several clean units such as the Filtration Adsorption type that can creative replace present toilet, electronics electrostatic adsorption type, ozonization type, disinfection by ultraviolet light type, light catalytic purifying.
Designed plasma reactor anelectrode is fixed on by some nickel chromium triangle tinsels or nickel chromium triangle metal tape and stops on the micro discharge conductor rail in the Athermal plasma purifying unit of the present invention, away from the insulation junctional complex; Be that the two ends that stop the micro discharge conductor rail are fixed with four anelectrode metal racks that quadrature is arranged on around the reactor again again, and make electric connection.The insulation junctional complex only is that an end face contacts with stoping micro discharge conductor rail surface, so compared with prior art, its micro discharge effect can be ignored substantially.The cross section that is noted that prevention micro discharge conductor rail especially is much bigger compared with nickel filament or nickel chromium triangle metal tape, even there is faint micro discharge effect, also can not influence plasma reactor operate as normal and service life thereof.Like this, make every nickel filament or metal tape in the direct current highfield, make stable corona discharge, obtain the high concentration plasma.Overcome " fine rule is the defective of broken string easily ", corrected and " would rather sacrifice the sterilizing and purifying effect, abandon the anelectrode of fine wire and select for use zigzag discharge electrode or the tip-like ionization utmost point with the reliability that exchanges disinfection purifier for and the technology prejudice of working life.”
The upper/lower terminal of every anelectrode metal rack of the present invention is established an insulation junctional complex installing hole corresponding with shell and is fixed, and the upper/lower terminal of described negative electrode is to be fixed on the outer casing inner wall, and makes electric connection.Like this, the anelectrode that some nickel filaments or nickel chromium triangle metal tape constitute, stop micro discharge conductor rail and four anelectrode metal racks and plasma reactor shell precision to join together, and insulating properties are good.Because the upper and lower both sides of negative electrode also are to be fixed on the shell, it guarantees that when integral installation anelectrode places adjacent two negative electrode middle part precision height, makes discharge evenly---this is the important indicator of weighing plasma reactor; It is firm that design also makes the overall structure of plasma reactor like this.Make the natural Athermal plasma purifying unit that is used for of newly-designed plasma reactor.
Pulse generator outfan in the designed pulse power of the present invention is provided with current detection circuit, can adjust the output pulse width of pulse generator automatically.Current detection circuit cooperates with the tacit agreement of digital control circuit, obtains the high-frequency narrow-pulse drive current, makes the plasma reactor that is capacitive produce the high concentration plasma, and the discharge current during work is stable.Pulse generator and pulse transformer are by the setting of inverse-excitation type inverter; Described secondary coil is that to turn to by section be that two line bags are in series at least, and the upper end of each line bag respectively is provided with a high pressure fast recovery diode.The distribution capacity of the primary coil of design pulse transformer and secondary coil descends by the index multiplying power of segmentation coiling line bag number like this, greatly improves rising, the fall off rate of its voltage pulse output.Voltage pulse output is stable, can not occur sparking and so on fault in the plasma reactor work that is capacitive.Mandatory declaration be, pulse generator and pulse transformer are pressed the setting of inverse-excitation type inverter, and it also makes the plasma reactor and the mains isolation that are attached thereto except finishing the task of boosting, the negative electrode of reactor and shell be ground connection directly, and electromagnetic shielding, security performance are better.
Obtaining beyond thought beneficial effect simultaneously is: can select for use common high anti-pressure power transistor to substitute super-high-speed high-power switching device expensive, that working life is short; The pulse current of inverse-excitation type inverter output is that pulse generator makes the magnetic energy abrupt release that is stored in the elementary winding of pulse transformer when turn-offing, and obtains the high-voltage corona discharge electric current of 70nS pulse rise time; Be when the plasma reactor accidental short circuit again, since the buffer action of inverse-excitation type inverter, the secondary ability conducting output of pulse transformator when namely pulse generator cuts out, thereby the switching semiconductor plumber of pulse power work is safe.
Air disinfection and purification of the present invention also has following advantage when working:
At first be that corona discharge is even because the anelectrode of reactor is thread or banded; The burst pulse voltage design of the pulse power is higher more than 20% than conventional electrical electrostatic adsorption type, also is not easy to carry out the transition to spark discharge; Available active particle also will exceed several magnitude than direct-current discharge method.
Next is in the fast rise electric field of burst pulse forward position, the corona zone is big in the non-thermal plasma reactor, the electron density of discharge space also increases, and the space charge effect in reactor distributes and is tending towards evenly, thereby active space is also big than AC-DC overlaying power electric discharge.
Complement each other between above-mentioned each parts of the present invention, it is 20 to 100KH that organic connections, the reactor work that makes the pulse power that the present invention designs for it realize that coupling is capacitive produce output pulse frequency
Z, during dutycycle 20%, pulse width 10---2uS, pulse rise time 70---120nS, pulse amplitude 12---18KV
P-P, disinfection factor is the Athermal plasma of high concentration.
The present invention has the broad-spectrum sterilization effect: to staphylococcus aureus, escherichia coli, bacillus subtilis, read viruses such as strain bacterium, mycete and mycoplasma, hepatitis B, influenza in vain killing rate is efficiently all arranged.Have dedusting simultaneously, the raw meat of dehematizing, the function of removing organic exhaust gas such as abnormal flavour, degradation of formaldehyde, smog and TVOC.Through surveying: the Staphylococcus albus of artificial spray-painting in 20m2 sealing space air, the average kill ratio behind the work 30min of the present invention is 99.98%, the killing rate of work 60min can be up to 100%.Degradation Formaldehyde rate 98.7%, ozone amount≤0.05mg/m is retained in suspended particles number≤350/L (Φ 〉=0.5 μ m) in the air
3
Energy-conservation is apparent: the present invention is at 100m
3The indoor reactor consumed power that reaches the II of hospital class environment disinfected standard is 7--8W, reaches the ultraviolet of effect same or the air disinfection purifier energy consumption of ozone and is at least 160W, and the energy consumption of high efficiency particle air filter, FFU is then bigger.
Generally speaking, the present invention has good reliability, long working life, generation plasma density height, improves air disinfection and purification efficient.Be not difficult to find out that project organization of the present invention is simple, and function is more complete, delicate structure, with low cost, energy-conservation.
Description of drawings:
Fig. 1 is the structural representation of Athermal plasma purifying unit of the present invention;
Fig. 2 is plasma reactor front section view of the present invention;
Fig. 3 is plasma reactor three-dimensional structure diagram of the present invention;
Fig. 4 is pulse power electrical schematic diagram of the present invention;
Fig. 5 is pulse transformer structural representation of the present invention;
Fig. 6 is pulse transformer circuit diagram of the present invention;
Fig. 7 is the current waveform figure of pulse power output of the present invention;
Fig. 8 is electromagnetic compatibility of the present invention, Conduction Interference test report.
The critical piece description of reference numerals:
1-plasma reactor 2-pulse power 3-fan assembly
The true 7-power coupling of 5-air inlet 6-air outlet
8-shell 809,810-air filter 101-anelectrode
102-negative electrode 103-stops micro discharge conductor rail 104-anelectrode metal rack
105-insulation junctional complex 106-insulation junctional complex gim peg 107-conductor rail ring for fixing
108-shell of reactor 201-EMC wave filter 202-rectification circuit
203-filter circuit 204-digital control circuit 205-pulse generator
206-pulse transformer 208-current detection circuit 209-abnormal state protection circuit
The elementary insulated coil skeleton of 210-pulse amplitude limiter circuit 211-212-multiple-grooved insulated coil skeleton
213-high-voltage conducting wires 214-primary coil 215-secondary coil
216-magnetic core 217-high pressure fast recovery diode 218-magnetic air gap
The specific embodiment:
With reference to the accompanying drawings embodiments of the invention are described in further detail.
Embodiment 1:
Fig. 1 is the structural representation of Athermal plasma purifying unit of the present invention; Fig. 2 is plasma reactor front section view of the present invention; Fig. 3 is plasma reactor three-dimensional structure diagram of the present invention.Athermal plasma purifying unit of the present invention comprises plasma reactor 1, the pulse power 2, fan assembly 3, air inlet 5, air outlet 6, power coupling 7 and shell 8, air inlet 5 is provided with air filter 809, air outlet 6 is provided with air filter 810, and plasma reactor 1 is arranged among the air-flow.Be provided with in the plasma reactor 1 some nickel chromium triangle tinsels or nickel chromium triangle metal tape in same plane by the equidistant anelectrode 101 that is arranged in parallel and makes, anelectrode 101 places adjacent two negative electrode 102 middle parts.Negative electrode 102 is that aluminium sheet or corrosion resistant plate are made, and Thickness Design is 0.8---1.5mm.Anelectrode 101 and negative electrode 102 be arranged in parallel by airflow direction, and windage is little, sterilization is even.The two ends of anelectrode 101 are to be fixed on to stop on the micro discharge conductor rail 103 in the corresponding groove, the two ends of another kind of technical scheme anelectrode 101 are to be fixed on to stop in the protuberance corresponding on the micro discharge conductor rail 103, and protuberance is to be designed to tip nail or elastic stainless steel sheet.Stop the two ends of micro discharge conductor rail 103 to be provided with Φ 4.1mm circular hole, be arranged on reactor four Φ 4mm cylinder anelectrode metal racks 104 all around with quadrature again and fix, and make electric connection.The upper/lower terminal of every anelectrode metal rack 104 is established insulation junctional complex 105 and shell of reactor 108 corresponding installing holes and is fixed, and by insulation joint pin gim peg 106 junctional complexs 105 that insulate is fastened on the shell of reactor 108.The upper/lower terminal of negative electrode 102 is directly to be fixed on metal shell of reactor 108 inwalls, and makes electric connection.Designed anelectrode metal rack 104 outer rims of the present invention are provided with the prevention micro discharge conductor rail ring for fixing 107 of internal orifice dimension 4.1mm, equally spaced adjacent prevention micro discharge conductor rail 103, the length of ring for fixing is set by the requirement that reduces the mutual shielding action of same polarity electromagnetic field.This routine conductor rail ring for fixing 107 is designed to 18---25mm.
The set anelectrode 101 of the present invention is to be located in the same plane by some nickel chromium triangle tinsels or nickel chromium triangle metal tape, and makes an assembly by the equidistant arrangement of 24mm optimum, amounts to n group (n is 40 following positive integers); Negative electrode 102 is that metallic plate is the n+1 piece; Optimum distance between anelectrode 101 and the negative electrode 102 is 12mm.
The present invention is provided with the wind deflector 15 of airtight usefulness in air inlet 5, air outlet 6 bottoms.Plasma reactor 1, fan assembly 3 are fixed on the wind deflector 812.Wind deflector 812 the right and lefts are respectively to be provided with hold-down screw 813 to link to each other with shell 8.In order to reduce plasma reactor 1 dust adsorbed amount, establish again in air filter 809 bottoms and imitate air filter 811 in one deck.The input of the pulse power 2 is provided with power coupling 7, and the pulse power 2 is installed in the top of shell 8.The position is provided with fixture 814 between shell 8 waists, in order to Athermal plasma purifying unit of the present invention is fixed on toilet's ceiling.When shell 8 sizes and the original high efficiency particle air filter that uses, FFU big or small identical, can directly upgrade replacement.
Contrast Fig. 4 pulse power electrical schematic diagram of the present invention; Fig. 5 is pulse transformer structural representation of the present invention; Fig. 6 is pulse transformer circuit diagram of the present invention.Be provided with in the pulse power 2 among the figure EMC wave filter 201, rectification circuit 202, filter circuit 203, digital control circuit 204, pulse generator 205, pulse transformer 206 successively order be electrically connected, the positive and negative outfan of pulse transformer 206 connects positive and negative two electrodes of plasma reactor 1 correspondence respectively.Positive pole is high potential, selects for use high-voltage conducting wires 213 to connect.Pulse generator 205 outfans are provided with current detection circuit 208, detected pulse generator output current signal is sent into agitator, error amplifier and PWM comparator in the digital control circuit 204, convert the input that exports pulse generator 205 behind the digital control electric current to, with the output pulse width of automatic adjustment pulse generator 205, keep plasma reactor 1 discharge stability.
Be provided with insulated-gate field-effect switching tube Q1 in the pulse generator 205, drain electrode meets the end a1 of the same name of primary coil 214, grid is connected by IC 1 outfan in resistor R4 and the digital control circuit 204, and source electrode meets the interior resistor R5 of current detection circuit 208.Switching tube Q1 also can establish insulated gate bipolar transistor, the corresponding drain electrode of function foot colelctor electrode, the corresponding source electrode of emitter stage.The logical pressure drop in the road of insulated gate bipolar transistor is low, and inversion efficiency is high slightly.Pulse generator 205 is by the setting of inverse-excitation type inverter with pulse transformer 206, and end a1 of the same name, the a2 of the primary coil 214 of pulse transformer 206 and secondary coil 215 and different name end b1, b2 oppositely arrange.Secondary coil 215 is that to turn to by section be that two line bags are in series at least, and the upper end of each line bag respectively is provided with a high pressure fast recovery diode 217.The positive pole of high pressure fast recovery diode 217 is connected on the end of electronegative potential line bag, and the negative pole of high pressure fast recovery diode 217 is connected on the initiating terminal of high potential line bag.High pressure fast recovery diode 217 is made high-frequency isolation with secondary coil 215 each line bag, and the distribution capacity of winding is by index decreased, is conducive to improve the rising edge of output pulse and the speed of trailing edge; Can also reduce the reverse proof voltage requirement to high pressure fast recovery diode 217, not only reduce cost, but also increased functional reliability, obtain beyond thought effect.
Filter capacitor C3 is in parallel with rectification circuit 202 dc output ends.Dropping resistor R1 is connected in digital control circuit 204 current supply circuits, and filter capacitor C4 is in parallel with digital control circuit 204 current supply circuits.Agitator loop external oscillation resistance device Rs and oscillating capacitor Cs in the digital control circuit 204.Rectification circuit 202 is to be connected by bridge rectifier by diode D1, D2, D3 and D4.The L of non-thermal plasma pulse power supply of the present invention, N input are provided with power coupling 7.
The pulse power 2 operation principles of Athermal plasma purifying unit of the present invention: when the switching tube Q1 in the pulse generator 205 is encouraged by pwm pulse and during conducting, secondary high pressure fast recovery diode 217 is because oppositely ending; Rectification circuit 202 VDs are applied to the two ends of pulse transformer 206 primary coils, this moment, primary coil 214 was equivalent to a pure inductance, flow through linear rising of electric current of primary coil 214, power supply energy is stored in the inductance of primary coil 214 with the magnetic energy form; When switching tube Q1 ends, because inductive current can not suddenly change, the primary coil 214 both end voltage poles reversal, polarity of voltage on the secondary coil 215 is put upside down and is made high pressure fast recovery diode 217 forward conductions, primary coil 214 energy stored are sent to secondary coil 215, provide the output pulse current to 1 power supply of external plasma reactor.
Be provided with after transition diode D5 and the fast recovery diode D6 differential concatenation in parallelly with primary coil 214 in the pulse amplitude limiter circuit 210 of the present invention, the positive pole of transition diode D5 is connected with the positive output end of rectification circuit 202.The positive pole of fast recovery diode D6 is connected with insulated-gate field-effect switching tube Q1 drain electrode, and capacitor C6 and transition diode D5 also connect.Transition diode D5 plays clamping action in pulse amplitude limiter circuit 210, when present embodiment is 220V when line voltage, and the preferred 1.5KE250A type of transition diode D5, operating current 4.2A, limiting voltage 237---263V.
Fig. 7 is the current waveform figure of pulse power output of the present invention.This discharge current waveform is that the sample resistance device at external plasma reactor 1 earth terminal of the outfan of pulse transformer 206 records.Digital oscilloscope shows and shows: pulse duty factor is 16%, and pulse width is 3uS, and be 70nS pulse rise time.Pulse transformer output electrion current waveform high conformity of the present invention, the corona discharge of plasma reactor 1 is stable.
Fig. 8 is electromagnetic compatibility of the present invention, Conduction Interference test report.Because non-thermal plasma pulse power supply of the present invention is provided with EMC wave filter 201, the two ends of pulse transformer 206 primary coils are provided with pulse amplitude limiter circuit 210, pulse generator 205 is by the setting of inverse-excitation type inverter with pulse transformer 206, external plasma reactor 1 and mains isolation, the direct ground connection of its shell, electromagnetic shielding, security performance are good.Test report shows: the present invention is in the 0.009---30MHz band limits, and the electromagnetic compatibility index meets domestic and international related standards regulation.
Embodiment 2:
The set prevention micro discharge conductor rail 103 of Athermal plasma purifying unit of the present invention is to be made by aluminium bar or stainless steel strip, and the two ends of the anelectrode 101 that some nickel chromium triangle tinsels or nickel chromium triangle metal tape are made are fixed in the groove that stops correspondence position on the micro discharge conductor rail 103 and are located; Also can be protruding tip instead of grooves, for fixing nickel chromium triangle tinsel still can, fixedly crooked drawback can appear in the nickel chromium triangle metal tape.The inventor designed with spring, stainless steel substrates and substituted groove position fixedly nickel chromium triangle tinsel, the nickel chromium triangle metal tape that stops correspondence position on the micro discharge conductor rail 103, above-mentioned defective all occurred; Especially severe be to open when blower fan because spring, stainless steel substrates exist elastic unstability to cause nickel chromium triangle tinsel, metal tape to rock more very, anelectrode 101 work sparkings influences the plasma reactor discharge stability and can hardly be avoided when serious.Anelectrode 101 is selected nickel chromium triangle tinsel or the nickel chromium triangle metal tape of high-resistance electrothermic alloy for use; Nickel chromium triangle wire diameter optimum is 0.20mm, or nickel chromium triangle metal tape optimum width is 2mm, and thickness is 0.08---0.10mm.
Embodiment 3:
The set pulse transformer 206 of Athermal plasma purifying unit of the present invention is provided with a multiple-grooved insulated coil skeleton 212, and secondary coil 215 is that three sections of branches, four sections or five sections are wound in the corresponding groove of multiple-grooved insulated coil skeleton 212 and are in series.In general, it is original about 1/9th that coil divides the winding distribution capacity of three sections coilings, and it is original about 1/25th that coil divides the winding distribution capacity of five sections coilings.The outfan of pulse transformer 206 is provided with high-voltage conducting wires 213 and is connected with the positive pole of plasma reactor 1.The proof voltage parameter of high pressure fast recovery diode 217 is 12KV at least, and recovery time is less than 80nS; Primary coil 214 is in elementary insulated coil skeleton 211, is provided with magnetic core 216 in the endoporus of elementary insulated coil skeleton 211 and multiple-grooved insulated coil skeleton 212 and makes electromagnetic coupled.Magnetic core 216 is iron-base ultramicro-crystal iron cores, is provided with magnetic air gap 218 in the magnetic loop, and the width that arranges of magnetic air gap 218 is 0.15---0.4mm, adjusted according to operating frequency and output; Most preferred embodiment operating frequency 38KHz, output 7W, it is 0.25mm that magnetic air gap 218 arranges width.Described magnetic core 216 also can be that the ferrite core material of R2KD is made.Just the work magnetic flux density of magnetic ferrite magnetic core is not high, pcrmeability is on the low side, winding coil need double and abovely just can reach original inductance value, and this can make the delivery efficiency of pulse transformer 206, pulse climbing speed index superior not as the iron-base ultramicro-crystal iron core certainly.
Embodiment 4:
Be provided with the silent ventilator of jagged edge fan blade in the fan assembly 3 of Athermal plasma purifying unit of the present invention, the sawtooth height is 8mm, and interdental space is 12mm.Fan assembly 3 is fixed on the shell 8 by blower fan fixing head 812 usefulness hold-down screws 813.According to bionic viewpoint, it is extremely low that the most advanced and sophisticated indentation of birds wing edge feather, wing fluctuate with high velocity air friction noise up and down.The silent ventilator of jagged edge fan blade contrasts with the common blower fan of same power, air quantity, and the average noise index will be hanged down 3-5dB.A kind of common blower fan external diameter is 220mm, the long 60mm of airduct, rated voltage 220V/50Hz, operating current 0.60A, air quantity 1200m
3Noise during/h is 59.5dB (A), changes that the actual measurement noise is 54.8dB (A) behind the onesize jagged edge fan blade.
Embodiment 5:
The output earth potential termination of the pulse transformer 206 that Athermal plasma purifying unit of the present invention is set has abnormal state protection circuit 209; be provided with optocoupler IC2 in the abnormal state protection circuit 209; the input 1 foot ground connection of optocoupler IC2; optocoupler IC2 input 2 feet are connected with the secondary coil different name end b2 of pulse transformer 206; optocoupler IC2 outfan 3 feet connect the negative output terminal of rectification circuit 202, and 4 feet of optocoupler IC2 are outfans.2, the 3 foot high-voltage capacitors connected in parallel device C7 of optocoupler IC2, sample resistance R6 is connected in parallel on the input of optocoupler IC2.Flowing through on the sample resistance R6 is pulse transformer 206 sampling current when delivering to the work of plasma reactor 1, after making electricity and isolate by optocoupler IC2 opto-electronic conversion, the operating signal current of plasma reactor 1 is delivered to error amplifier and PWM comparator in the digital control circuit 204.When plasma reactor 1 work, be damaged, wear out, the abnormality signal code during short circuit passes through optocoupler IC2 and converts optical signal to; carry out restoring into after photoelectricity is isolated the signal of telecommunication and deliver to digital control circuit 204 processing; the pulsewidth of PWM comparator is zero; insulated-gate field-effect switching tube Q1 is closed, and realizes protection automatically.
Embodiment 6:
The set EMC wave filter 201 of Athermal plasma purifying unit of the present invention is provided with differential mode inductance device LI and common-mode inductor L2 series connection, EMC wave filter 201 input shnt capacitor C1, EMC wave filter 201 outfan shnt capacitor C2.Removal is by rectification circuit 202, switching tube Q1 and the caused most of differential mode of pulse transformer 206 work, common mode interference signal.
Athermal plasma purifying unit of the present invention is that device is on toilet's ceiling, make room air pass through reactor with the speed of per second 0.3-0.6 rice, flow through the flow of Athermal plasma purifying unit by per hour calculating, and is ten times of room air total amount at least; When clean room space is big, when the capacity of an Athermal plasma purifying unit is not enough, can a plurality ofly install and use side by side.
The plasma application that corona discharge is produced according to the invention described above not only can be killed the quasi-microorganism of virus, antibacterial in air disinfection and purification, decomposes the gaseous contamination Organic substance, also can isolate pellet from air-flow.
The scope of application of the present invention is the factory toilet: the place that cleanliness factors such as food factory, electronics, optics, precision instrument, workshop bio-pharmaceuticals research department, laboratory and hospital operating room, isolation ward are had relatively high expectations; Also can be used for the air disinfection and purification of public places such as office block, meeting room, cinema, train, automobile, subway, naval vessel, avoid cross infection.Especially the epidemic situation was severe for current global influenza A H1N1, the death nearly 10000 people, and the countries and regions that epidemic situation occurs have reached 199 more than, have arrived the high-incidence season, and are of the present invention significant.
The above only is that the present invention of embodiment with reference to accompanying drawing has done to further specify, and is not limitation of the invention.In technical concept scope of the present invention, those skilled in the art can all belong in the scope of technical solution of the present invention by stoping micro discharge technology and pulse power content thereof to make the variety of way simple deformation that comprises material or be equal to alternatively in the designed plasma reactor of the invention of above-mentioned announcement.For example: described anelectrode is some nickel chromium triangle tinsels or nickel chromium triangle metal tape, can change molybdenum, tungsten into and make rib type, ellipse, triangle and do to be equal to alternative.But oxidation resistent susceptibility is poor in the mechanical strength of molybdenum, tungsten material and the air; Rib type, ellipse, leg-of-mutton anelectrode processing difficulties.Four anelectrode metal racks can be reduced to two even one, the electric connection difficulty of this structure, and poor electric contact appears in the long-time running meeting.Being provided with insulated-gate field-effect switching tube Q1 in the pulse generator can substitute with bipolar transistor or IGBT ... it only is for example that the simple deformation of above-mentioned variety of way or be equal to substitutes.Self-evident, all belong in the technical concept scope of the present invention, can't depart from spirit of the present invention or surmount the scope of claims definition.
Claims (6)
1. Athermal plasma purifying unit, comprise plasma reactor (1), the pulse power (2), fan assembly (3), air inlet (5), air outlet (6), power coupling (7) and shell (8), air inlet (5) is provided with air filter (809), air outlet (6) is provided with air filter (810), plasma reactor (1) is arranged among the air-flow, it is characterized in that being provided with in the described plasma reactor (1) some nickel chromium triangle tinsels or nickel chromium triangle metal tape in same plane by the equidistant anelectrode (101) that is arranged in parallel and makes, anelectrode (101) places adjacent two negative electrodes (102) middle part; The two ends of anelectrode (101) are to be fixed on to stop micro discharge conductor rail (103) to be gone up in corresponding groove or the protuberance, the two ends of prevention micro discharge conductor rail (103) are arranged on reactor four anelectrode metal racks (104) all around with quadrature again and fix, and make electric connection; The upper/lower terminal of every anelectrode metal rack (104) is established insulation junctional complex (a 105) installing hole corresponding with shell of reactor (108) and is fixed; The upper/lower terminal of described negative electrode (102) is directly to be fixed on the metal shell of reactor (108), and makes electric connection; Be provided with in the described pulse power (2) EMC wave filter (201), rectification circuit (202), filter circuit (203), digital control circuit (204), pulse generator (205), pulse transformer (206) successively order be electrically connected the external plasma reactor of outfan (1) of pulse transformer (206); Described pulse generator (205) outfan is provided with current detection circuit (208), detected pulse generator output current signal is sent into agitator, error amplifier and the PWM comparator that is located in the digital control circuit (204), convert the input that exports pulse generator (205) behind the digital control electric current to; Being provided with insulated-gate field-effect switching tube Q1 in described pulse transformer (206) and the pulse generator (205) is the setting of inverse-excitation type inverter.
2. the Athermal plasma purifying unit that waits according to claim 1, it is characterized in that described prevention micro discharge conductor rail (103) is to be made by aluminium bar or stainless steel strip, the two ends of the anelectrode (101) that some nickel chromium triangle tinsels or nickel chromium triangle metal tape are made are fixed on and stop micro discharge conductor rail (103) to be gone up in the groove of correspondence position or the protuberance to be located; The nickel chromium triangle wire diameter of anelectrode (101) is 0.20mm, or nickel chromium triangle metal tape width is 2mm, and thickness is 0.08---0.10mm.
3. Athermal plasma purifying unit according to claim 1, it is characterized in that described pulse transformer (206) is provided with a multiple-grooved insulated coil skeleton (212), secondary coil (215) is that three sections to five sections of branches are wound in the corresponding groove of multiple-grooved insulated coil skeleton (212) and are in series; Be provided with magnetic core (216) in the endoporus of primary coil (214) and secondary coil (215) and make electromagnetic coupled, be provided with magnetic air gap (218) in the magnetic loop of magnetic core (216); Magnetic core (216) is used the iron-base ultramicro-crystal iron core, or ferrite core is set.
4. Athermal plasma purifying unit according to claim 1 is characterized in that being provided with in the fan assembly (3) silent ventilator of jagged edge fan blade, and the sawtooth height is 8mm, and interdental space is 12mm.
5. Athermal plasma purifying unit according to claim 1; the output earth potential termination that it is characterized in that described pulse transformer (206) has abnormal state protection circuit (209); the outfan of abnormal state protection circuit (209) is connected with digital control circuit (204) input; pulse transformer (206) is delivered to the operating current sampling of plasma reactor (1); signal code after photoelectricity is isolated is sent into digital control circuit (204) input, and the control electric current after digital processing is delivered to pulse generator (205) input from digital control circuit (204) outfan.
6. Athermal plasma purifying unit according to claim 1, it is characterized in that described EMC wave filter (201) is provided with differential mode inductance device LI and common-mode inductor L2 series connection, EMC wave filter (201) input shnt capacitor C1, EMC wave filter (201) outfan shnt capacitor C2.
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| CN103007329B (en) * | 2012-12-30 | 2015-01-28 | 苏州贝昂科技有限公司 | Ion wind purifier for noise reduction |
| EP3291846A4 (en) * | 2015-05-07 | 2018-12-05 | The Regents of The University of Michigan | Process for electro-hydrodynamically enhanced destruction of chemical air contaminants and airborne inactivation of biological agents |
| CN106004353B (en) * | 2016-06-24 | 2018-06-15 | 刘世超 | A kind of vehicle-mounted air purification device |
| CN106731540A (en) * | 2016-11-23 | 2017-05-31 | 中科益盛科技有限公司 | A kind of useless processor of gaseous molecular resonance poison |
| CN109000309A (en) * | 2018-06-29 | 2018-12-14 | 芜湖迅创信息科技有限公司 | A kind of rail air purification vehicle |
| CN110946178B (en) * | 2019-11-25 | 2022-05-31 | 大连理工大学 | Atmospheric pressure low temperature plasma fruit fresh-keeping device |
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|---|---|---|---|---|
| JP2005222779A (en) * | 2004-02-04 | 2005-08-18 | Ngk Insulators Ltd | Plasma processing device |
| CN101394067B (en) * | 2007-09-17 | 2012-05-23 | 黄思伦 | Adjustable high-voltage negative ion generating device |
| JP2009110752A (en) * | 2007-10-29 | 2009-05-21 | Kyocera Corp | Plasma generating body, plasma generating apparatus, ozone generating apparatus, and exhaust gas treatment apparatus |
| CN101385867A (en) * | 2008-10-09 | 2009-03-18 | 浙江佩洁尔医疗科技有限公司 | Central plasma air sterilization purifier |
| CN201586246U (en) * | 2009-12-31 | 2010-09-22 | 周云正 | Non-thermal plasma purification unit |
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2009
- 2009-12-31 CN CN 200910113651 patent/CN101920032B/en active Active
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| CN101920032A (en) | 2010-12-22 |
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