CN103623925B - Atmospheric particulates bipolarity charge device - Google Patents
Atmospheric particulates bipolarity charge device Download PDFInfo
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- CN103623925B CN103623925B CN201310573629.0A CN201310573629A CN103623925B CN 103623925 B CN103623925 B CN 103623925B CN 201310573629 A CN201310573629 A CN 201310573629A CN 103623925 B CN103623925 B CN 103623925B
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Abstract
One is used for realizing particle bipolarity charge device, utilize and hand over the mode of high-voltage field ionize frequently to produce bipolarity free ion district, realize efficiently charged to the particle of micron order broad particle size range from nanoscale, comprise prime particle cutter, the charged chamber of particle, high pressure ionization chamber, hand over high voltage source frequently; Compact conformation of the present invention, easy to maintenance, effectively charged to the Atmospheric particulates in micron order broad particle size range of nanoscale can be realized; Can be used for based on electromigration characteristic monitoring instrument particle early stage charged and make its reach Boltzmann's charge balance distribution.
Description
Technical field
The present invention relates to and a kind ofly can realize method that in Atmospheric particulates broad particle size range, bipolarity is efficiently charged and device, belong to atmospheric aerosol monitoring technical field.
Background technology
In recent years, atmosphere pollution is day by day serious, and gray haze event takes place frequently, and ozone and airborne fine particulate matter concentration constantly raise as its principal character.Nanoscale fine particle in mass concentration the proportion the highest due to concentration almost can be ignored, therefore only the actual demand that can not meet prediction of air quality, Environmental capacity and scientific research is monitored to particle mass concentration, strengthen particle size and measurement of concetration has important practical significance.For a long time, optical means to be lived the primary particulate particle diameter and measurement of concetration that are directly discharged in air because its original position, online, quick, contactless measurement advantage are usually used in human being's production, and for be transformed by photochemical reaction by dusty gas in air, particle diameter is less, concentration is higher, on the larger secondary aerosol species of ecosystem impact, usually need the method combined with optics by electricity to carry out grain size grading and measurement.Fine particle state-of-charge under natural environment is normally unknown, need realize the again charged of particle by additional householder method and reach known state-of-charge (distribution of Boltzmann's charge balance), such device is often called as charging neutrality source.
For a long time, the radioactive substance stability and high efficiency that is applied to realizing particle as a kind of stable ionization source is charged.For the consideration of security, this type of charging neutrality source uses at home and is subject to strict management and control.Patent 200910117124.7 proposes a kind of unipolarity aerosol electrostatic averager, high pressure ionization is utilized to produce unipolarity charging area, because unipolarity ion concentration is higher, therefore in such and source is mainly towards laboratory research, for the charged of nano level superfine particle and measurement.For nearly micron-sized bulky grain thing, electrode adsorption is often caused to lose because carrying capacity is too high.200710059569.5 in devise a kind of bipolarity aerosol electrostatic averager, this averager comprises in electrostatic and casing, high voltage source output device, two high-field electrodes, air inlet, gas outlet and mixing air mouth is provided with in electrostatic He on casing, the position of air inlet, gas outlet is relative, two high-field electrodes are boundling needle electrode, be separately fixed at casing both sides, box house is fixed with column earth plate, and two high-field electrodes are received in the output of described high voltage source output device.High voltage source output device is for exporting the adjustable voltage of 0 ~ ± 10KV.This charging neutrality source needs clean gas flow as electric charge carrier gas, and this is difficult to meet the charged demand of particle under multiple field observation condition.Meanwhile, because positive and negative electrode is relative, larger flow rate of carrier gas is needed effectively could to reduce the adsorption loss of free charge.Owing to not arranging any particle diameter cutter sweep, in surrounding air, entering of large-size particles thing will obtain a large amount of free charges thus the charged efficiency reducing small particle.The present invention is intended to obtain a kind of complex condition Atmospheric particulates nanoscale that can realize to the high-performance charge method for electrically in micron order broad particle size range and device.
Summary of the invention
The object of the invention is: overcome the deficiencies in the prior art, provide a kind of Charging Techniques and device of Atmospheric particulates stability and high efficiency, the Size rapid classification that can be used for based on particle electromigration characteristic is measured; And structure is simple, convenient later maintenance, can realize efficiently charged to micron order broad particle size range endoparticle thing of complex condition Atmospheric particulates nanoscale.
In order to achieve the above object, the technical solution adopted in the present invention is: Atmospheric particulates bipolarity charge device, utilize impacting type particle cutting method, realize the elementary cutting of particle diameter of ambient air particle, remove bulky grain thing to the excessive adsorption of free charge and the pollution to charged cavity; Utilize strong alternating electric field to realize field-ionization and obtain enough bipolarity free charges, what realize from nanoscale to micron particles thing is efficiently charged.
Atmospheric particulates bipolarity charge device of the present invention comprises: the charged chamber 2 of impacting type particle cutter 1, particle, high pressure ionization chamber 3 and friendship high voltage source 4 frequently; Described impacting type particle cutter 1 outside is cylindrical structure, and inside is cylindrical hollow configuration, is made up of sample gas air inlet pipe 5, cutter lid 6, cutting wall 7, inertial impaction platform 8; Described cutter lid 6 is the integrated design with sample gas air inlet pipe 5, and there is gear edge cutter lid 6 end, and is connected with cutting wall 7 by screw thread, and there is O-ring seals junction; Inertial impaction platform 8 is the integrated design with cutting wall 7, and inertial impaction platform 8 and cutter lid 6, the coaxial installation of sample gas air inlet pipe 5; Outside, described particle charged chamber 2 is rectangular structure, and inner space is cylindrical hollow configuration, is made up of charged chamber wall 9, sample gas gas outlet 10; Wall 9 front portion, charged chamber is connected with inertial impaction platform 8 internal run-through, and rear portion is connected with sample gas gas outlet 10 is through; Outside, high pressure ionization chamber 3 is cylindrical structural, and inside is cylindrical hollow configuration, is made up of high-voltage discharging electrode 11, high-field electrode fixed pedestal 12 and charged chamber wall 13; High-voltage discharging electrode 11 is fixed on fixed pedestal 12, and is connected with friendship frequency high voltage source 4; Described high-voltage discharging electrode 11, fixed pedestal 12, the airtight coaxial installation of charged chamber wall 13, fixed pedestal 12 is detachable with charged chamber wall 13 later stage.Described sample gas air inlet pipe 5 outer end is cylindrical, for connecting extraneous sampling pipe; The other end is that aperture accelerates orifice design, accelerates in order to the moment realizing particle in sample gas.
Described inertial impaction platform 8 top is the thin metal layer through roughening process, and lower floor is hollow cylindrical structure, and the face of cylinder has rectangular slot, realizes the UNICOM of cutter cavity and inertial impaction platform inner space.
Described high-voltage discharging electrode 11 is tungsten pin, and being connected and fixed pedestal 12 one end is cylindrical structural, and the other end is needle-like structures, and tip position and charged chamber wall 9 inner surface tangent.
Described fixed pedestal 12 is insulation polytetrafluoroethylene (PTFE) material, and inside is hollow cylindrical structure, in order to installation high-voltage sparking electrode 11.
In described impacting type particle cutter 1, sample gas air inlet pipe 5, cutter lid 6, cutting wall 7, inertial impaction platform 8 all adopt aluminium matter; In the charged chamber of described particle 2, charged chamber wall 9, sample gas gas outlet 10 all adopt aluminium matter; Described high pressure ionization chamber 3 ionization chamber wall 13 is aluminium matter.
Described friendship frequently high voltage source 4 provides 0 ~ ± 5KV alternation high pressure.
Described impacting type particle cutter 1, the charged chamber of particle 2, the equal good earth of high pressure ionization chamber 3 outer wall.
Cardinal principle of the present invention is: utilize particle inertia incision principle, realizing under the prerequisite that air-flow velocity accurately controls, by rational Design on Plane sample gas air inlet diameter and to the distance of clashing into table top, the particle diameter realizing particle is separated (particle of particle diameter more than 1 μm is trapped within inertial impaction indoor).Utilize and hand over high voltage electric field frequently tungsten pin electrode surrounding air in ionization chamber cavity to be ionized, simultaneously under the effect of alternating electric field, part free ion is transported in the central core region of charging particle chamber, after aerosol gas sample to be measured enters charging area, moment completes charged process with the unipolarity particle of high concentration.Because tungsten pin electrode is positioned at high pressure ionization chamber, turn round and look at that it is less to the adsorption loss of particle.
The present invention compared with prior art has the following advantages:
(1) general principle is the electric discharge of bipolarity field-ionization, with the use drawback in source during thorough solution airborne fine particulate matter monitoring field radioactivity is charged.
(2) high-performance impacting type particle filter, under the prerequisite realizing particle size Accurate Classification, greatly reduces the pollution problem of aerosol Large stone particle to charged system and the absorption of free electron;
(3) ionization chamber and the charged chamber of particle adopt separation design, free charge is progressively transported to particle charging area under the effect of alternating electric field, greatly reduce the high-pressure electrostatic adsorption loss of charged inside cavity, improve the charged efficiency of airborne fine particulate matter further.
Accompanying drawing explanation
Fig. 1 is present system structural representation.
Detailed description of the invention
As shown in Figure 1, an embodiment of present system comprises: the charged chamber 2 of impacting type particle cutter 1, particle, high pressure ionization chamber 3 and friendship high voltage source 4 frequently.Impacting type particle cutter 1 outside is cylindrical structure, and inside is cylindrical hollow configuration, is made up of sample gas air inlet pipe 5, cutter lid 6, cutting wall 7, inertial impaction platform 8.Sample gas air inlet pipe 5 outer end is cylindrical, for connecting extraneous sampling pipe; The other end is that aperture accelerates orifice design, and the moment realizing particle in sample gas under suction effect accelerates.Cutter lid 6 and sample gas air inlet pipe 5 are the integrated design, and there is gear edge end, and are connected with cutting wall 7 by screw thread, and there is O-ring seals junction.Inertial impaction platform 8 top is the thin metal layer through roughening process, and lower floor is hollow cylindrical structure, and the face of cylinder has rectangular slot, can realize inertia cutter cavity and the UNICOM of clashing into platform inner space.Inertial impaction platform 8 is the integrated design with cutting wall 7, and with cutter lid 6, the coaxial installation of sample gas air inlet pipe 5.Sample gas air inlet pipe 5, cutter lid 6, cutting wall 7, inertial impaction platform 8 all adopt aluminium matter.
Outside, particle charged chamber 2 is rectangular structure, and wall 2 rear and front end, charged chamber has through hole, and inner space is cylindrical hollow configuration, is made up of charged chamber wall 9, sample gas gas outlet 10.Particle charged chamber interior or exterior space, through hole are coaxial.Charged chamber wall 2 sidewall is connected with high pressure ionization chamber is through.Charged chamber wall 9, sample gas gas outlet 10 all adopt aluminium matter.
Outside, high pressure ionization chamber 3 is cylindrical structural, and inside is cylindrical hollow configuration, is made up of high-field electrode 11, high-field electrode fixed pedestal 12, charged chamber wall 13; High-voltage discharging electrode 11 is tungsten pin, and being connected and fixed pedestal 12 one end is cylindrical structural, and the other end is needle-like structures, and tip position and charged chamber wall 9 inner surface tangent; Fixed pedestal 12 is isolation material, and inside is hollow cylindrical structure, connects with high-voltage discharging electrode 11 is airtight.High-voltage discharging electrode 11, fixed pedestal 12, the airtight coaxial installation of charged chamber wall 13, fixed pedestal 12 is detachable with charged chamber wall 13 later stage, facilitates the daily cleaning of high-voltage discharging electrode.Top, high pressure ionization chamber 3 is run through with particle charged chamber 2 sidewall and is connected.High pressure ionization chamber 3 ionization chamber wall 13 be aluminium matter.
Hand over high voltage source 4 to be frequently connected with high-voltage discharging electrode 11 by high-voltage insulating wire, 0 ~ ± 5KV alternation high pressure can be provided.
The course of work of apparatus of the present invention is: bear the effect of suction at air pump of bleeding under, sampling air flow through sample gas air inlet pipe 5 and through spout accelerate after enter impacting type particle cutter 1, the larger particle of particle diameter clashes into and is trapped within inertial impaction platform 8 due to the effect of centrifugal force, and the less particle of particle diameter to enter by the slit on inertial impaction platform 8 sidewall with air-flow that to clash into platform 8 inner, and then enter in the charged chamber 2 of particle.
High-voltage discharging electrode 11, under the friendship of handing over high voltage source 4 frequently to provide frequently high pressure, produces high strength and periodically shakes electric field, constantly ionized by air and produce bipolarity electric charge around high-voltage discharging electrode 11.Bipolarity free charge, under the effect of electric field, progressively to the regional movement away from spray point, and finally reaches particle charged chamber 2 axial location.Because this axial location is away from high-voltage discharging electrode 11, effectively can reduces in ionization process and the Electrostatic Absorption of particle is lost.Particle after charged continues along charged chamber 2 axial-movement under the effect of air-flow, and leaves the charged chamber 2 of particle by the sample gas outlet of rear end.
Non-elaborated part of the present invention belongs to the common practise of those skilled in the art.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. Atmospheric particulates bipolarity charge device, is characterized in that comprising: impacting type particle cutter (1), the charged chamber of particle (2), high pressure ionization chamber (3) and friendship high voltage source (4) frequently; Described impacting type particle cutter (1) outside is cylindrical structure, inside is cylindrical hollow configuration, is made up of sample gas air inlet pipe (5), cutter lid (6), cutting wall (7), inertial impaction platform (8); Described cutter lid (6) and sample gas air inlet pipe (5) are the integrated design, and there is gear edge cutter lid (6) end, and are connected with cutting wall (7) by screw thread, and there is O-ring seals junction; Inertial impaction platform (8) is the integrated design with cutting wall (7), and inertial impaction platform (8) and cutter lid (6), sample gas air inlet pipe (5) coaxial installation; Outside, the charged chamber of described particle (2) is rectangular structure, and inner space is cylindrical hollow configuration, is made up of charged chamber wall (9), sample gas gas outlet (10); Front portion, charged chamber wall (9) is connected with inertial impaction platform (8) internal run-through, and rear portion is connected with sample gas gas outlet (10) is through; Outside, high pressure ionization chamber (3) is cylindrical structural, and inside is cylindrical hollow configuration, is made up of high-voltage discharging electrode (11), high-field electrode fixed pedestal (12) and charged chamber wall (13); High-voltage discharging electrode (11) is fixed on fixed pedestal (12), and is connected with friendship frequency high voltage source (4); Described high-voltage discharging electrode (11), fixed pedestal (12), the airtight coaxial installation in charged chamber wall (13), fixed pedestal (12) is detachable with charged chamber wall (13) later stage.
2. Atmospheric particulates bipolarity charge device according to claim 1, is characterized in that: described sample gas air inlet pipe (5) outer end is cylindrical, for connecting extraneous sampling pipe; The other end is that aperture accelerates orifice design, accelerates in order to the moment realizing particle in sample gas.
3. Atmospheric particulates bipolarity charge device according to claim 1, it is characterized in that: described inertial impaction platform (8) top is the thin metal layer through roughening process, lower floor is hollow cylindrical structure, and the face of cylinder has rectangular slot, realize the UNICOM of cutter cavity and inertial impaction platform inner space.
4. Atmospheric particulates bipolarity charge device according to claim 1, it is characterized in that: described high-voltage discharging electrode (11) is tungsten pin, being connected and fixed pedestal (12) one end is cylindrical structural, the other end is needle-like structures, and tip position and charged chamber wall (9) inner surface tangent.
5. Atmospheric particulates bipolarity charge device according to claim 1, it is characterized in that: described fixed pedestal (12) is insulation polytetrafluoroethylene (PTFE) material, inside is hollow cylindrical structure, in order to installation high-voltage sparking electrode (11).
6. Atmospheric particulates bipolarity charge device according to claim 1, is characterized in that: described impacting type particle cutter (1) interior sample gas air inlet pipe (5), cutter lid (6), cutting wall (7), inertial impaction platform (8) all adopt aluminium matter; In the charged chamber of described particle (2), charged chamber wall (9), sample gas gas outlet (10) all adopt aluminum; Described high pressure ionization chamber (3) ionization chamber wall (13) is aluminum.
7. Atmospheric particulates bipolarity charge device according to claim 1, is characterized in that: described friendship frequently high voltage source (4) provides 0 ~ ± 5KV alternation high pressure.
8. Atmospheric particulates bipolarity charge device according to claim 1, is characterized in that: described impacting type particle cutter (1), the charged chamber of particle (2), the equal good earth of high pressure ionization chamber (3) outer wall.
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| CN201310573629.0A CN103623925B (en) | 2013-11-14 | 2013-11-14 | Atmospheric particulates bipolarity charge device |
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| CN103623925B true CN103623925B (en) | 2015-12-30 |
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| CN106076626B (en) * | 2016-06-07 | 2017-08-25 | 燕山大学 | A kind of multistage electrostatic dust removal equipment based on particle scale |
| CN108554632B (en) * | 2018-01-08 | 2020-09-29 | 合肥工业大学 | Device for carrying out electrostatic collection on sample particles by using charge application method |
| CN108828334B (en) * | 2018-04-09 | 2020-08-11 | 中国矿业大学 | Flat plate type particle charge quantity measuring device and method utilizing charge neutralization |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1768411A (en) * | 2003-04-04 | 2006-05-03 | Jeol美国公司 | Atmospheric pressure ion source |
| JP2008070281A (en) * | 2006-09-15 | 2008-03-27 | Shimadzu Corp | Charge device |
| CN101155458A (en) * | 2007-09-11 | 2008-04-02 | 天津大学 | Aerosol electrostatic averager |
| CN101581698A (en) * | 2009-06-23 | 2009-11-18 | 中国科学院安徽光学精密机械研究所 | Aerosol field ionization electric charge source device |
| CN101981441A (en) * | 2008-03-25 | 2011-02-23 | 国立大学法人大阪大学 | Electric discharge ionization current detector |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6448777B1 (en) * | 2001-08-20 | 2002-09-10 | Agilent Technologies, Inc. | Hermetically-sealed miniaturized discharge ionization detector |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1768411A (en) * | 2003-04-04 | 2006-05-03 | Jeol美国公司 | Atmospheric pressure ion source |
| JP2008070281A (en) * | 2006-09-15 | 2008-03-27 | Shimadzu Corp | Charge device |
| CN101155458A (en) * | 2007-09-11 | 2008-04-02 | 天津大学 | Aerosol electrostatic averager |
| CN101981441A (en) * | 2008-03-25 | 2011-02-23 | 国立大学法人大阪大学 | Electric discharge ionization current detector |
| CN101581698A (en) * | 2009-06-23 | 2009-11-18 | 中国科学院安徽光学精密机械研究所 | Aerosol field ionization electric charge source device |
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