CN106869747B - A kind of window screen device and its working method stopping PM2.5 - Google Patents
A kind of window screen device and its working method stopping PM2.5 Download PDFInfo
- Publication number
- CN106869747B CN106869747B CN201710035260.6A CN201710035260A CN106869747B CN 106869747 B CN106869747 B CN 106869747B CN 201710035260 A CN201710035260 A CN 201710035260A CN 106869747 B CN106869747 B CN 106869747B
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- screen window
- layer screen
- window
- gauze
- internal layer
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 150000001450 anions Chemical class 0.000 claims abstract description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 claims abstract description 8
- 125000000129 anionic group Chemical group 0.000 claims abstract description 7
- 238000005507 spraying Methods 0.000 claims abstract description 7
- 239000013618 particulate matter Substances 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- 229910052742 iron Inorganic materials 0.000 claims 1
- 239000007921 spray Substances 0.000 claims 1
- 239000000428 dust Substances 0.000 abstract description 4
- 238000009423 ventilation Methods 0.000 abstract description 4
- 239000008187 granular material Substances 0.000 abstract description 3
- 239000003570 air Substances 0.000 description 9
- 239000008280 blood Substances 0.000 description 4
- 210000004369 blood Anatomy 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000005457 optimization Methods 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000017531 blood circulation Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 239000003574 free electron Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000012857 repacking Methods 0.000 description 2
- 206010007559 Cardiac failure congestive Diseases 0.000 description 1
- 241000255925 Diptera Species 0.000 description 1
- 206010019280 Heart failures Diseases 0.000 description 1
- 102000010445 Lactoferrin Human genes 0.000 description 1
- 108010063045 Lactoferrin Proteins 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 208000007502 anemia Diseases 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 210000000621 bronchi Anatomy 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 210000004351 coronary vessel Anatomy 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001784 detoxification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 208000019622 heart disease Diseases 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- CSSYQJWUGATIHM-IKGCZBKSSA-N l-phenylalanyl-l-lysyl-l-cysteinyl-l-arginyl-l-arginyl-l-tryptophyl-l-glutaminyl-l-tryptophyl-l-arginyl-l-methionyl-l-lysyl-l-lysyl-l-leucylglycyl-l-alanyl-l-prolyl-l-seryl-l-isoleucyl-l-threonyl-l-cysteinyl-l-valyl-l-arginyl-l-arginyl-l-alanyl-l-phenylal Chemical compound C([C@H](N)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CS)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CC=1C2=CC=CC=C2NC=1)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CC=1C2=CC=CC=C2NC=1)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCSC)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC(C)C)C(=O)NCC(=O)N[C@@H](C)C(=O)N1CCC[C@H]1C(=O)N[C@@H](CO)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CS)C(=O)N[C@@H](C(C)C)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](C)C(=O)N[C@@H](CC=1C=CC=CC=1)C(O)=O)C1=CC=CC=C1 CSSYQJWUGATIHM-IKGCZBKSSA-N 0.000 description 1
- 229940078795 lactoferrin Drugs 0.000 description 1
- 235000021242 lactoferrin Nutrition 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 208000023504 respiratory system disease Diseases 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
- E06B9/52—Devices affording protection against insects, e.g. fly screens; Mesh windows for other purposes
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
- E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B7/00—Special arrangements or measures in connection with doors or windows
- E06B7/28—Other arrangements on doors or windows, e.g. door-plates, windows adapted to carry plants, hooks for window cleaners
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T23/00—Apparatus for generating ions to be introduced into non-enclosed gases, e.g. into the atmosphere
Abstract
The invention discloses a kind of window screen devices and its working method for stopping PM2.5, including outer layer screen window and internal layer screen window, the outer layer screen window and internal layer screen window are fixed by plastic window frame, it is corresponded on two layers of gauze of the outer layer screen window and internal layer screen window and several equally distributed small magnets in array arrangement is installed, anion generator is installed at the top of the plastic window frame, the anion generator includes anionic generating circuit and the carbon brush head for externally spraying anion, the anionic generating circuit is mounted in plastic window frame, the carbon brush head for externally spraying anion is located at the centre of two layers of gauze of outer layer screen window and internal layer screen window, direction is vertically downward, electronics is longitudinally discharged between two layers of gauze of screen window, it is full of electronics in gauze.Present invention can ensure that effectively preventing haze from entering room under conditions of ventilation, and indoor dust granules can be purified, achieve the effect that clean air.
Description
Technical field
The invention belongs to a kind of composite window screens, and in particular to a kind of window screen device and its working method for stopping PM2.5.
Background technique
High concentration PM2.5 pollution effect ambient air quality and health.PM2.5 refer in atmosphere diameter be less than or
Particulate matter equal to 2.5 μm, also referred to as lung particulate matter.Everyone averagely about sucks about 10,000 liters of air daily, enters
The micronic dust of alveolar, which can be absorbed rapidly, blood circulation is directly entered without liver detoxification is distributed to whole body；Secondly, blood can be damaged
Lactoferrin conveys the ability of oxygen, loses blood.For the patient of anaemia and blood circulation disorder, it is possible to create serious consequence.
For example, respiratory disease can be aggravated, or even cause the heart diseases such as congestive heart failure and coronary artery.These particles
Can also enter blood by bronchus and alveolar, the dissolutions such as pernicious gas therein, heavy metal in blood, to human health
Injury it is bigger.In recent years, PM2.5 high pollution event takes place frequently, sometime up to 800-900 μ g/m3, than the mark of national regulation
75 μ g/m of standard3Standard be higher by more than 10 times.
As resident's living conditions are continuously improved, the increase of living space brings the increase of door and window area, various landings
Door and window enters huge numbers of families, and screen window becomes essential a part of living at home.However according to reckoning, daily from common screen window into
Enter to indoor particulate matter and accounts for the 80% of indoor total particle object amount.During gray haze occurs, a large amount of residents have put on mouth in outdoor
Cover, but cannot but wear masks always indoors.Due to the needs of ventilation, a large amount of PM2.5 is entered further through window
The indoor environment of resident causes outdoor big haze and indoor small haze.
The common screen window of present commercial type generally can only play shielding action to mosquito, and fine particulates are risen not
To filtration.Common dustproof screen window if it were not for from screen window physically by increase screen window grid mesh number, otherwise
Stick one layer of adsorbent material just to improve the filter efficiency to particulate matter, but not for the filter efficiency of fine particulates
It is good, it not can effectively solve indoor PM2.5 concentration problems under outdoor haze weather.The band for the anion that negative ion powder is discharged
Electricity is limited, if be coated directly on common window screening as anti-haze barrier, small and weak electric field force is difficult completely
The haze particle caught through window screening is flutterred, and the macroscopic void of window screening is also difficult to stop the large particle in air, and anti-haze is not achieved
Effect.
For the development innovation for effectively pushing PM2.5 protective mesh window, reaching prevents air pollution, especially in air can
Damage of the particulate matter to human body is sucked, so needing a kind of window screen device for stopping PM2.5.
Summary of the invention
Goal of the invention: in order to solve the deficiencies in the prior art, the present invention provides it is a kind of stop PM2.5 window screen device and
Its working method.
Technical solution: a kind of window screen device stopping PM2.5, including outer layer screen window and internal layer screen window, the outer layer screen window
It is fixed by plastic window frame with internal layer screen window, corresponds and be equipped on two layers of gauze of the outer layer screen window and internal layer screen window
Several equally distributed small magnets in array arrangement, are equipped with anion generator at the top of the plastic window frame, described
Anion generator includes anionic generating circuit and the carbon brush head for externally spraying anion, the anionic generating circuit
It is mounted in plastic window frame, the carbon brush head for externally spraying anion is located at two layers of yarn of outer layer screen window and internal layer screen window
The centre of net, direction vertically downward, longitudinally discharge electronics between two layers of gauze of screen window, are full of electronics in gauze.
As optimization: the outer layer screen window and internal layer screen window are glass fibre material.
As optimization: the small magnet on the gauze of the outer layer screen window and internal layer screen window respectively corresponds as the pole N and the pole S, shape
At lateral, vertical with beam direction stabilizing magnetic field.
As optimization: the small magnet is in magnetic stripe shape or magnetic patch shape.
A kind of working method of the window screen device of the bimetallic net blocking PM2.5: the electricity of anion generator is opened
Source is located at the carbon brush head for externally injection anion of the centre of two layers of gauze of outer layer screen window and internal layer screen window, in yarn
Electronics is longitudinally discharged between two layers of gauze of window, electronics is used to adsorb the particulate matter in air；And outer layer screen window and internal layer screen window
Small magnet on gauze will form stabilizing magnetic field lateral, vertical with beam direction, due to the effect of Lorentz force, absorption
The electronics of particulate matter in air is bound, and is moved in a circle in magnetic field, and decline deposits to plastic window in the shape of a spiral
The bottom of frame, to effectively prevent the entrance of haze.
The utility model has the advantages that the present invention utilizes anion launcher, electronics is longitudinally discharged between two layers of gauze of screen window, makes electricity
Son is full of in gauze.For better about beam electrons, increase the concentration of electronics between gauze, it is flat with beam direction on screen window
Capable installation small magnet array, forms lateral, vertical with beam direction stabilizing magnetic field.Due to Lorentz force, electronics exists
It moves in a circle in magnetic field, electronics is bound, and reduces the escape of free electron between gauze, makes its concentration in two layers of gauze
It improves, to effectively prevent the entrance of haze.
In haze weather, this screen window by repacking, it is ensured that effectively haze is prevented to enter room under conditions of ventilation
Between, and indoor dust granules can be purified, achieve the effect that clean air.
Detailed description of the invention
Fig. 1 is the side structure schematic view in the present invention；
Fig. 2 is partial structural diagram in the present invention.
Specific embodiment
The present invention is further explained in the light of specific embodiments.
Embodiment
As shown in Figs. 1-2, a kind of window screen device stopping PM2.5, including outer layer screen window 1 and internal layer screen window 2, the outer layer
Screen window 1 and internal layer screen window 2 are fixed by plastic window frame, and one is a pair of on two layers of gauze of the outer layer screen window 1 and internal layer screen window 2
Several equally distributed small magnets 3 in array arrangement should be installed, anion hair is installed at the top of the plastic window frame
Raw device 4, the anion generator 4 includes anionic generating circuit and the carbon brush head for externally spraying anion, described negative
Ion generation circuit is mounted in plastic window frame, and the carbon brush head for externally spraying anion is located at outer layer screen window 1 and interior
The centre of two layers of gauze of layer screen window 2, direction vertically downward, longitudinally discharges electronics between two layers of gauze of screen window, fills electronics
Reprimand is in gauze.Small magnet 3 on the gauze of the outer layer screen window 1 and internal layer screen window 2 respectively corresponds as the pole N and the pole S, formation cross
To, vertical with beam direction stabilizing magnetic field.The outer layer screen window 1 and internal layer screen window 2 are glass fibre material.It is described
Small magnet 3 is in magnetic stripe shape or magnetic patch shape.
A kind of working method of the window screen device of the bimetallic net blocking PM2.5: the electricity of anion generator is opened
Source is located at the carbon brush head for externally injection anion of the centre of two layers of gauze of outer layer screen window and internal layer screen window, in yarn
Electronics is longitudinally discharged between two layers of gauze of window, electronics is used to adsorb the particulate matter in air；And outer layer screen window and internal layer screen window
Small magnet on gauze will form stabilizing magnetic field lateral, vertical with beam direction, due to the effect of Lorentz force, absorption
The electronics of particulate matter in air is bound, and is moved in a circle in magnetic field, and decline deposits to plastic window in the shape of a spiral
The bottom of frame, to effectively prevent the entrance of haze.
The present invention utilizes anion generator, longitudinally discharges electronics between two layers of gauze of screen window, is full of electronics in yarn
In net.For better about beam electrons, increase the concentration of electronics between gauze, the installation parallel with beam direction is small on screen window
Magnet array forms lateral, vertical with beam direction stabilizing magnetic field.Due to Lorentz force, electronics does circle in magnetic field
Zhou Yundong, electronics are bound, and reduce the escape of free electron between gauze, improve its concentration in two layers of gauze, thus
The effective entrance for preventing haze.
In haze weather, this screen window by repacking, it is ensured that effectively haze is prevented to enter room under conditions of ventilation
Between, and indoor dust granules can be purified, achieve the effect that clean air.
The present invention is not limited to above-mentioned preferred forms, anyone can show that other are various under the inspiration of the present invention
The product of form, however, make any variation in its shape or structure, it is all that there is skill identical or similar to the present application
Art scheme, is within the scope of the present invention.
Claims (1)
1. a kind of window screen device for stopping PM2.5, including outer layer screen window (1) and internal layer screen window (2), the outer layer screen window (1) and
Internal layer screen window (2) is fixed by plastic window frame, it is characterised in that: two layers of yarn of the outer layer screen window (1) and internal layer screen window (2)
Online correspond is equipped with several equally distributed small magnets (3) in array arrangement, the top peace of the plastic window frame
Equipped with anion generator (4), the anion generator (4) includes anionic generating circuit and sprays anion for external
Carbon brush head, the anionic generating circuit is mounted in plastic window frame, described for externally spraying the carbon brush head position of anion
In the centre of outer layer screen window (1) and two layers of gauze of internal layer screen window (2), direction vertically downward, is indulged between two layers of gauze of screen window
To release electronics, it is full of electronics in gauze；
Small magnet (3) on the gauze of the outer layer screen window (1) and internal layer screen window (2) respectively corresponds as the pole N and the pole S, formation cross
To, vertical with beam direction stabilizing magnetic field；
The small magnet (3) is in magnetic stripe shape or magnetic patch shape；
The outer layer screen window (1) and internal layer screen window (2) are glass fibre material；
Bimetallic net stops the working method of the window screen device of PM2.5 as follows: opening the power supply of anion generator, is located at outer
The carbon brush head for externally injection anion of the centre of two layers of gauze of layer screen window and internal layer screen window, in two layers of gauze of screen window
Between longitudinally discharge electronics, electronics is used to adsorb the particulate matter in air；And the small magnetic on the gauze of outer layer screen window and internal layer screen window
Iron will form stabilizing magnetic field lateral, vertical with beam direction and adsorb in air due to the effect of Lorentz force
The electronics of grain object is bound, and is moved in a circle in magnetic field, and decline deposits to the bottom of plastic window frame in the shape of a spiral, thus
The effective entrance for preventing haze.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710035260.6A CN106869747B (en) | 2017-01-18 | 2017-01-18 | A kind of window screen device and its working method stopping PM2.5 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710035260.6A CN106869747B (en) | 2017-01-18 | 2017-01-18 | A kind of window screen device and its working method stopping PM2.5 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106869747A CN106869747A (en) | 2017-06-20 |
| CN106869747B true CN106869747B (en) | 2019-11-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710035260.6A Active CN106869747B (en) | 2017-01-18 | 2017-01-18 | A kind of window screen device and its working method stopping PM2.5 |
Country Status (1)
| Country | Link |
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| CN (1) | CN106869747B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140140406A (en) * | 2013-05-29 | 2014-12-09 | 이혜민 | Antibacterial insect net using hard charcoal |
| CN104197423A (en) * | 2014-08-25 | 2014-12-10 | 山东润泰智能电气有限公司 | Photo-electromagnetic-ion high-voltage electrostatic air cleaner and cleaning method thereof |
| CN105909161A (en) * | 2016-06-30 | 2016-08-31 | 南通大学 | Double-metal net PM2.5 blocking window screen device and working method thereof |
| CN106089010A (en) * | 2016-06-30 | 2016-11-09 | 南通大学 | A kind of electron wind formula intercepts window screen device and the method for work thereof of cleaning PM2.5 |
| CN106283100A (en) * | 2015-05-22 | 2017-01-04 | 陈世浩 | Magnetic field hydrogen production process and device |
-
2017
- 2017-01-18 CN CN201710035260.6A patent/CN106869747B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140140406A (en) * | 2013-05-29 | 2014-12-09 | 이혜민 | Antibacterial insect net using hard charcoal |
| CN104197423A (en) * | 2014-08-25 | 2014-12-10 | 山东润泰智能电气有限公司 | Photo-electromagnetic-ion high-voltage electrostatic air cleaner and cleaning method thereof |
| CN106283100A (en) * | 2015-05-22 | 2017-01-04 | 陈世浩 | Magnetic field hydrogen production process and device |
| CN105909161A (en) * | 2016-06-30 | 2016-08-31 | 南通大学 | Double-metal net PM2.5 blocking window screen device and working method thereof |
| CN106089010A (en) * | 2016-06-30 | 2016-11-09 | 南通大学 | A kind of electron wind formula intercepts window screen device and the method for work thereof of cleaning PM2.5 |
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| CN106869747A (en) | 2017-06-20 |
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| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Qiang Inventor after: Wu Tingxi Inventor after: Yin Yue Inventor after: Chen Yun Inventor after: Deng Jie Inventor after: Zhu Haifeng Inventor before: Yin Yue Inventor before: Lin Fan Inventor before: Wang Qiang Inventor before: Chen Yun Inventor before: Deng Jie Inventor before: Zhu Haifeng Inventor before: Deng Honghai Inventor before: You Min |
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Effective date of registration: 20210618 Address after: 226019 No.205, building 6, Nantong University, No.9, Siyuan Road, Nantong City, Jiangsu Province Patentee after: Center for technology transfer, Nantong University Address before: 226000 Jiangsu city of Nantong province sik Road No. 9 Patentee before: NANTONG University |
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| CP03 | Change of name, title or address |
Address after: 226001 No.9, Siyuan Road, Chongchuan District, Nantong City, Jiangsu Province Patentee after: Nantong University Technology Transfer Center Co.,Ltd. Address before: 226019 No.205, building 6, Nantong University, No.9, Siyuan Road, Nantong City, Jiangsu Province Patentee before: Center for technology transfer, Nantong University |
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| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20170620 Assignee: Nantong Guanjun Automation Technology Co.,Ltd. Assignor: Nantong University Technology Transfer Center Co.,Ltd. Contract record no.: X2023980054513 Denomination of invention: A window screen device for blocking PM2.5 and its working method Granted publication date: 20191105 License type: Common License Record date: 20231229 |