CN105268554A - Electrode structure, dust collection method and air purifier - Google Patents
Electrode structure, dust collection method and air purifier Download PDFInfo
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- CN105268554A CN105268554A CN201510836945.1A CN201510836945A CN105268554A CN 105268554 A CN105268554 A CN 105268554A CN 201510836945 A CN201510836945 A CN 201510836945A CN 105268554 A CN105268554 A CN 105268554A
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- 239000000428 dust Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 75
- 230000005684 electric field Effects 0.000 claims abstract description 36
- 230000005686 electrostatic field Effects 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000011151 fibre-reinforced plastic Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 238000005728 strengthening Methods 0.000 claims description 2
- 230000002708 enhancing effect Effects 0.000 claims 1
- 150000002500 ions Chemical class 0.000 abstract description 51
- 230000000694 effects Effects 0.000 abstract description 9
- 238000001556 precipitation Methods 0.000 description 8
- 238000000746 purification Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000004887 air purification Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The invention provides an electrode structure, a dust collection method and an air purifier with the electrode structure. The electrode structure has a significantly improved dust collecting effect against the formed ion wind. An ion wind electrode structure according to the invention comprises: the first electrode ionizes air flowing through, so that ions are generated, and particulate matters in the air are charged; applying an electric field to enable charged particles to form ion wind in the electric field, and primarily collecting the charged particles; and the second electrode is arranged at the rear side of the first electrode along the direction of the ion wind and is used for further collecting the charged particles.
Description
Technical field
The invention belongs to air purification field, especially relate to a kind of ion wind electrode structure of electric precipitation formula, dust collecting method and adopt the air purifier of this electrode structure.
Background technology
Air purifier refers to and can adsorb, decomposes or various pollutant in invert atmosphere thus improve the device of air cleanliness.Filtering type air purifier and electric precipitation formula air purifier can be divided into according to concrete dedusting method.Wherein, electric precipitation formula air purifier is make the pollutant in air charged by corona discharge, utilizes dust collect plant to trap charged particle, thus reaches the object purified air.
Fig. 4 shows the structural representation of the electrode structure in a kind of electric precipitation formula air purifier of the prior art.As shown in Figure 4, described ion wind electrode structure comprises, and pole 41 and earthing pole 42 occur corona.There is 41 pairs, pole earthing pole 42 corona discharge in corona, air, at corona, ionization near pole 42 occurs.Particle in air and the air collides of ionization thus charged, occur there is stronger electric field between pole 41 and earthing pole 42 at corona, charged particle thing accelerated in the electric field, forms ion wind.Particle moves to earthing pole 42 in the electric field, and is finally grounded pole 42 and collects.For ensureing to form ion wind, needing to increase die opening d, and improving plus high-pressure U1, the direction that such charged particle thing complies with flow field is in the electric field accelerated.But the defect brought thus is, owing to accelerating to cause the excessive velocities of charged particle thing when arriving at earthing pole, causes being grounded and extremely effectively collecting, thus affecting the single dust collection efficiency of earthing pole.
Fig. 5 shows the structural representation of the electrode structure in prior art in another electric precipitation formula air purifier.As shown in Figure 5, described electrode structure comprises one can there is pole 51 by the lower ion of making alive, provides the repeller 53 collecting electric field, and collects the earthing pole 52 of dust.Because its structure limits, the breakdown voltage that pole 51 and repeller 53 occur ion is little, and electric field is weak, can not form ion wind in-between the electrodes, therefore needs additional blower fan to drive.The defect of this kind of electrode structure, the first compares the electrode structure shown in Fig. 4, and it is low that pole energy occurs its ion, and the amount of ions of generation is little; It two is because electric field is weak, and dust collection efficiency is not high.
Fig. 6 shows another electrode structure of the prior art.As shown in Figure 6, this kind of electrode structure combines the structure shown in Fig. 4 and Fig. 5, namely on the basis of structure shown in Fig. 4, increases repeller 43.Thus, this electrode structure ensure that the formation of ion wind, and due to the setting of repeller 43, compensate for particle excessive velocities and collect not enough situation.Such as, but due to structure restriction, it is fixing to there is pole 41 structure in earthing pole 42 and corona, therefore still exists because electric field is weak, the defect that dust collection efficiency is not high.
Therefore, be necessary to propose the high electrode structure of a kind of dust collection efficiency.
Summary of the invention
The basis that the present invention be directed to the above-mentioned defect that prior art exists proposes.That is, the present invention proposes a kind of electrode structure, dust collecting method and has the air purifier of this electrode structure.This electrode structure has the dust collecting effect significantly improved for formed ion wind.
According to a first aspect of the invention, a kind of ion wind electrode structure is provided, comprise: the first electrode, the air flowed through is ionized, thus generation ion, electric charge on the particle band in air, and by applying electric field, make charged particle form ion wind in the electric field, and primary collection is carried out to described charged particle; And
Second electrode, along the direction of described ion wind, is arranged on the rear side of the first electrode, for collecting further described charged particle.
Further, wherein, described first electrode is ion wind electrode; And described second electrode is stationary electrode.
Further, there is pole in corona, is provided for the air flowing through this corona generation pole and ionizes, thus make the particle in air charged; And earthing pole, for the above-mentioned charged particle of primary collection;
Wherein, make charged particle in the electric field to earthing pole motion at the corona described electric field occurred between pole and earthing pole, thus form described ion wind.
Further, described second electrode comprises positive pole for the formation of strong electrostatic field and negative pole.
Further, the spacing between the electrode of described earthing pole is relatively large; And spacing between the electrode of described second electrode is relatively little.
Further preferably, the described spacing between the electrode of described earthing pole is 13-39mm; Described spacing between the electrode of described second electrode is 0-10mm.
Further, described primary collection is for collecting the particle with relative Large stone; And describedly to collect further for collecting the particle with relative small particle diameter.
Further, described second electrode is flat, grating type or corrugated electrode.
Further, the strong electrostatic field formed between described positive pole and negative pole is the electric field of 15kv/cm ~ 80kv/cm.
Further, the electrode surface of described second electrode covers dielectric, or the material of described second electrode is carbon fibre reinforced plastic.
Further, described electrode structure comprises further: air-flow generating unit, for strengthening wind speed.
Further, described air-flow generating unit is fan.
According to a further aspect in the invention, provide a kind of air purifier, comprise electrode structure as described in above any one.
According to a third aspect of the invention we, a kind of dust collecting method is provided, comprises:
Step S1: produce ion wind, even if the air flowed through ionizes, thus produces ion, electric charge on the particle band in air, and applies electric field, make charged particle form ion wind in the electric field;
Step S2: preliminary control of dust, the particle that namely primary collection is charged; And
Step S3: control of dust further, namely collects further for the charged particle thing be not collected in step s 2.
Further, the described preliminary control of dust in step S2 is for collecting the particle with relative Large stone; And the described further control of dust in step S3 is for collecting the particle with relative small particle diameter.
Further, air-flow generating unit is utilized to strengthen wind speed in step S1.
Electrode structure according to the present invention, dust collecting method and air purifier, because described ion wind pole and strong stationary electrode separate, ion wind pole provides circulating current, a large amount of ions, and the particle that collection cut size is larger (more than 0.3 μm), highfield pole, the second level is then to after first order purification, still escape and the seizure of small size particle (less than 0.3 μm) brute force, significantly improve dust collecting effect, particularly, disposable percent of pass > 99.9%.
Do further detailed description below in conjunction with the drawings and the specific embodiments to technical scheme of the present invention, beneficial effect of the present invention will be clear and definite further.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a part of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.
Fig. 1 (a), (b) respectively illustrate the schematic diagram according to the first electrode of the present invention one preferred embodiment and the formation of the second electrode.
Fig. 2 shows the process schematic according to of the present invention one preferred electrode structure, the particle in air being carried out to control of dust.
Fig. 3 shows the method flow utilizing electrode structure of the present invention to carry out control of dust.
Fig. 4 shows the structural representation of the electrode structure in a kind of electric precipitation formula air purifier of the prior art.
Fig. 5 shows the structural representation of the electrode structure in prior art in another electric precipitation formula air purifier.
Fig. 6 shows the structural representation of the electrode structure in prior art in another electric precipitation formula air purifier.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with the specific embodiment of the invention and corresponding accompanying drawing, technical solution of the present invention is clearly and completely described.Obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 (a), (b) respectively illustrate the schematic diagram according to the first electrode of the present invention one preferred embodiment and the formation of the second electrode.As shown in Fig. 1 (a), (b), described electrode structure comprises the first electrode 1 and the second electrode 2 be relatively provided separately.Wherein, the first electrode 1 is, such as ion wind electrode, for generation of ion wind, and carries out preliminary control of dust.Particularly, the first electrode 1 makes the air flowing through it ionize, thus produces ion, electric charge on the particle band in air; And by applying electric field, making charged particle form ion wind in the electric field, and primary collection is carried out to described charged particle.Second electrode 2 is, such as stationary electrode, and can be the last one stationary electrode, is arranged at the rear side of the first electrode 1, for further control of dust along ion wind direction.Below respectively the first electrode 1 and the second electrode 2 are further described.
As shown in Fig. 1 (a), the first electrode 1 is such as ion wind electrode, comprises corona and pole 11 and earthing pole 12 occur.Wherein, there is the corona wire (not shown) generation corona discharge of pole 11 in corona, makes air occur to ionize near pole 11 at corona, thus produce a large amount of ion.Flow through electric charge on the particle band in the air of described corona wire.Owing to occurring there is stronger electric field U1 between pole 11 and earthing pole 12 at corona, make charged particle in the electric field to earthing pole motion, and, because the direction of motion of ion and charged particle is consistent with air channel, thus form ion wind.Further, charged particle moves to earthing pole 12 in the electric field, and is tentatively grounded pole 12 and collects.Concrete, this first electrode preferably collects the particle with greater particle size, such as the particle of more than 0.3 μm.
It should be noted that herein, because the first electrode 1 can be preliminary control of dust, therefore, its design can not consider dust catching efficiency, and to provide circulating current, produce a large amount of ions and to produce ion wind for major design object, thus more loose to the requirement of its design, realize above-mentioned purpose.
In addition, consider due to the particle for Large stone that the first electrode 1 is collected, easily block, therefore, can preferably arrange relatively large by the spacing of the earthing pole 12 of the first electrode, such as spacing can be set to 13mm-39mm, thus be convenient to cleaning, ensure the effect of control of dust and purification of air.
But due to the effect of the first electrode 1, ion wind, after the larger speed of acquisition, causes a part of fine particle to be not easy to be grounded pole 12 and collects.For this reason, the present invention, by arranging the second electrode at the first electrode rear side, with further control of dust, thus makes above-mentioned fine particle and is not collected by the second electrode by the dust that the first electrode is collected.Below the second electrode is further described.
As shown in Fig. 1 (b), the second electrode 2 is such as stationary electrode, comprise for applying voltage to produce negative pole 21 and the positive pole 22 of electric field, by the voltage applied on this positive pole and negative pole, formed and there is some strength, the electric field of such as 15kv/cm ~ 80kv/cm.Described electric field for parallel pole, for positive and negative two interelectrode electrical potential differences are divided by the distance of electrode.Therefore, for ensureing strong electrostatic field, the spacing between above-mentioned positive and negative two electrodes is preferably little as far as possible, and such as preferably plate distance between plates is 0-10mm.Although it is pointed out that the spacing between the second electrode two positive and negative electrode is relatively little herein, because it mainly collects the particle of small particle diameter, even if therefore do not clean the effect also not affecting its control of dust and purification of air.
This second electrode 2 is relative with the first electrode 1 to be separated, and be arranged on the rear side of first electrode in the direction along ion wind, because it has stronger strong electrostatic field, therefore for the particle through the first electrode 1 primary collection, it such as, to not carried out further powerful seizure by the particle that the first electrode 1 is collected, small size particle (less than 0.3 μm).
Described second electrode 2 can be the electrode of flat, grating type and the form such as corrugated, and owing to being provided separately with the first electrode, its structure is by the restriction of the first electrode.
Meanwhile, for improving the breakdown voltage of electrostatic field, thus strengthen electric field further, the electrode surface of described second electrode 2 preferably covers dielectric, or adopts special conductive materials to manufacture this second electrode, preferably, and such as carbon fibre reinforced plastic.
In addition, for improving air circulation further, the generation of assisting ion wind, can arrange gas current generating unit, such as fan, after being preferably arranged on the second electrode in described electrode structure.The present invention, due to the existence of the strong electrostatic field of the second electrode 2, can not reduce single dust collection efficiency because the increase of fan causes ion wind velocity to improve.
Above electrode structure of the present invention is described, can be clear and definite, the mode that the present invention utilizes first and second electrode bipolar collaborative, adopts secondary control of dust.The first order is ion wind pole, provides circulating current and a large amount of ions, and the particle that primary collection particle diameter is larger.Highfield pole, the second level is then to after first order purification, and still escape and small size particle carry out brute force seizure.Thus considerably improve the effect of control of dust and purification of air.Through experimental verification, the dust collection efficiency of electrode structure of the present invention can reach, disposable percent of pass > 99.9%.
Obviously, electrode structure of the present invention can be applied in air purifier, realizes purification of air.
The above-mentioned electrode structure of following correspondence is described dust collecting method of the present invention.
Fig. 2 shows the process schematic according to of the present invention one preferred electrode structure, the particle in air being carried out to control of dust.Fig. 3 shows the method flow utilizing electrode structure of the present invention to carry out control of dust.As shown in Figure 3, described dust collecting method comprises:
S1: produce ion wind.As shown in Figure 2, there is the air of pole 11 in the corona flowing through the first electrode 1, due to corona wire generation corona discharge, occurs to ionize near pole 11, thus produce a large amount of ion, electric charge on the particle band in air at corona.Owing to occurring there is stronger electric field U1 between pole 11 and earthing pole 12 at corona, make charged particle in the electric field to earthing pole motion, and, because the direction of motion of ion and charged particle is consistent with air channel, thus form ion wind.
S2: preliminary control of dust.Charged particle moves to earthing pole 12 in the electric field, and is tentatively grounded pole 12 and collects, as shown in Figure 2.Concrete, this first electrode preferably collects the particle with greater particle size, such as the particle of more than 0.3 μm.
S3: control of dust further.Due to the effect of the first electrode 1, ion wind, after the larger speed of acquisition, causes a part of fine particle to be not easy to be grounded pole 12 and collects, and continues motion.Now, the second electrode by being arranged on the first electrode rear side on ion wind direction collects dust further.Thus make above-mentioned fine particle and do not collected by the second electrode by the dust that the first electrode is collected, as shown in Figure 2.
Thus, as shown in Figure 2, the air flowing through the second electrode becomes the clean air wherein not containing particle, thus reaches the object of purification of air.
Above electrode structure of the present invention and dust collecting method thereof are described in detail.Can find out, the present invention works in coordination with the mode of control of dust by above-mentioned secondary, significantly improves dust collecting effect.
The foregoing is only embodiments of the invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within right of the present invention.
Claims (16)
1. an electrode structure, is characterized in that, comprising:
First electrode, makes the air flowed through ionization occur and produce ion, electric charge on the particle band in air, and by applying electric field, making charged particle form ion wind in the electric field, and carrying out primary collection to described charged particle; And
Second electrode, along the direction of described ion wind, is arranged on the rear side of the first electrode, for collecting further described charged particle.
2. electrode structure as claimed in claim 1, is characterized in that, wherein,
Described first electrode is ion wind electrode; And
Described second electrode is stationary electrode.
3. electrode structure as claimed in claim 1 or 2, it is characterized in that, wherein, described first electrode comprises:
There is pole in corona, is provided for the air flowing through this corona generation pole and ionization occurs and produces ion, thus make the particle in air charged; And
Earthing pole, for the above-mentioned charged particle of primary collection;
Wherein, the described electric field occurred between pole and earthing pole at corona makes charged particle move to described earthing pole in the electric field, thus forms described ion wind.
4. the electrode structure as described in any one of claim 1-3, is characterized in that, wherein
Described second electrode comprises positive pole for the formation of strong electrostatic field and negative pole.
5. electrode structure as claimed in claim 3, is characterized in that, wherein
Spacing between the electrode of described earthing pole is relatively large; And
Spacing between the electrode of described second electrode is relatively little.
6. electrode structure as claimed in claim 5, is characterized in that, wherein
Described spacing between the electrode of described earthing pole is 13-39mm;
Described spacing between the electrode of described second electrode is 0-10mm.
7. the electrode structure as described in any one of claim 1-6, is characterized in that, wherein
Described primary collection has the particle of relative Large stone for collecting; And
Describedly to collect further for collecting the particle with relative small particle diameter.
8. the electrode structure as described in any one of claim 1-7, is characterized in that, wherein
Described second electrode is flat, grating type or corrugated electrode.
9. electrode structure as claimed in claim 4, is characterized in that, wherein
The strong electrostatic field formed between described positive pole and negative pole is the electric field of 15kv/cm ~ 80kv/cm.
10. the electrode structure as described in any one of claim 1-9, is characterized in that, wherein
The electrode surface of described second electrode covers dielectric, or the material of described second electrode is carbon fibre reinforced plastic.
11. electrode structures as described in any one of claim 1-10, it is characterized in that, described electrode structure comprises further:
Air-flow generating unit, for strengthening wind speed.
12. electrode structures as claimed in claim 11, is characterized in that, wherein
Described air-flow generating unit is fan.
13. 1 kinds of air purifiers, comprise the electrode structure as described in any one of claim 1-12.
14. 1 kinds of dust collecting methods, is characterized in that, comprising:
Step S1: produce ion wind, that is, make the air flowed through ionization occur and produce ion, electric charge on the particle band in air, and apply electric field, make charged particle form ion wind in the electric field;
Step S2: preliminary control of dust, that is, the particle that primary collection is charged; And
Step S3: control of dust further, that is, collect further for the charged particle thing be not collected in step s 2.
15. methods as claimed in claim 14, is characterized in that, wherein
Described preliminary control of dust in step S2 is for collecting the particle with relative Large stone; And
Described further control of dust in step S3 is for collecting the particle with relative small particle diameter.
16. methods as described in claims 14 or 15, is characterized in that, wherein
Air-flow generating unit auxiliary enhancing wind speed is utilized in step S1.
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| CN106196556A (en) * | 2016-08-30 | 2016-12-07 | 冯肇霖 | A kind of multifunctional air purifying module and its implementation |
| CN106568126A (en) * | 2016-10-25 | 2017-04-19 | 珠海格力电器股份有限公司 | Air purification device and method |
| CN106762034A (en) * | 2016-11-11 | 2017-05-31 | 成都陵川特种工业有限责任公司 | A kind of dedusting hush pipe of use high-pressure electrostatic absorption |
| CN107028765A (en) * | 2017-05-05 | 2017-08-11 | 盐城卫生职业技术学院 | Pharmaceutical process plant and drug handling device |
| CN107360659A (en) * | 2017-07-13 | 2017-11-17 | 珠海格力电器股份有限公司 | Plasma generator and purifier |
| CN107755094A (en) * | 2017-09-11 | 2018-03-06 | 广东美的制冷设备有限公司 | Electrostatic precipitation module and conditioner |
| CN108452946A (en) * | 2018-01-29 | 2018-08-28 | 珠海格力电器股份有限公司 | Air purification device and cleaning method thereof |
| CN108452946B (en) * | 2018-01-29 | 2024-04-12 | 珠海格力电器股份有限公司 | Air purifying device and cleaning method thereof |
| CN110496705A (en) * | 2018-05-20 | 2019-11-26 | 同祥科技(北京)股份有限公司 | A kind of open air purifier |
| CN109013061A (en) * | 2018-07-10 | 2018-12-18 | 合肥工业大学 | A kind of device for realizing particulate matter electrostatic collection using ionization method |
| CN109013061B (en) * | 2018-07-10 | 2020-05-12 | 合肥工业大学 | A device for electrostatic collection of particulate matter using ionization method |
| CN109046785A (en) * | 2018-08-07 | 2018-12-21 | 佛山市科蓝环保科技股份有限公司 | A kind of industry lampblack cleaning equipment |
| CN112566727A (en) * | 2018-08-15 | 2021-03-26 | 三菱动力环保有限公司 | Electric dust collector |
| CN109530088A (en) * | 2018-11-20 | 2019-03-29 | 南昌航空大学 | A method of the raising air purification efficiency based on graphite fibre |
| CN109596490A (en) * | 2018-11-28 | 2019-04-09 | 珠海格力电器股份有限公司 | Data processing method of dust sensor |
| CN113227668B (en) * | 2018-12-27 | 2023-02-28 | 三星电子株式会社 | Blower and air conditioner having the same |
| CN113227668A (en) * | 2018-12-27 | 2021-08-06 | 三星电子株式会社 | Blower and air conditioner having the same |
| CN109847938B (en) * | 2019-04-22 | 2024-05-10 | 珠海格力电器股份有限公司 | Air purifying device and dust collecting mechanism |
| CN109847938A (en) * | 2019-04-22 | 2019-06-07 | 珠海格力电器股份有限公司 | Air cleaning device and dust collecting mechanism |
| CN110404681A (en) * | 2019-08-05 | 2019-11-05 | 北京中科纳清科技股份有限公司 | The filter and air cleaning facility of composite particles electrification and adsorption function |
| CN110479486A (en) * | 2019-08-07 | 2019-11-22 | 宁波威霖住宅设施有限公司 | Particulate matter processing auxiliary dust collecting structure before a kind of filter |
| CN110560267A (en) * | 2019-09-19 | 2019-12-13 | 珠海格力电器股份有限公司 | Electrode structure and electrostatic purification equipment |
| CN110849897A (en) * | 2019-12-16 | 2020-02-28 | 中国工程物理研究院激光聚变研究中心 | Optical component surface non-contact cleaning monitoring and processing system |
| CN110813924A (en) * | 2019-12-16 | 2020-02-21 | 中国工程物理研究院激光聚变研究中心 | Treatment system for particle contaminants on the surface of optical elements |
| CN110813924B (en) * | 2019-12-16 | 2024-08-23 | 中国工程物理研究院激光聚变研究中心 | Treatment system for particulate contaminants on the surface of optical elements |
| CN110849897B (en) * | 2019-12-16 | 2024-11-29 | 中国工程物理研究院激光聚变研究中心 | Non-contact type cleaning monitoring and processing system for surface of optical element |
| CN112871455A (en) * | 2021-04-07 | 2021-06-01 | 爱沐风优(西安)生物科技有限公司 | Air purification's hierarchical electric field |
| WO2025001003A1 (en) * | 2023-06-27 | 2025-01-02 | 珠海格力电器股份有限公司 | Electric purification apparatus, air purifier, and electric purification method |
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