CN203757957U - Preferential plasma purification device - Google Patents
Preferential plasma purification device Download PDFInfo
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- CN203757957U CN203757957U CN201420098764.4U CN201420098764U CN203757957U CN 203757957 U CN203757957 U CN 203757957U CN 201420098764 U CN201420098764 U CN 201420098764U CN 203757957 U CN203757957 U CN 203757957U
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- air
- high voltage
- voltage source
- controller
- purification device
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- 238000000746 purification Methods 0.000 title claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 25
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 239000007789 gas Substances 0.000 claims abstract description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 13
- 229910052710 silicon Inorganic materials 0.000 claims description 13
- 239000010703 silicon Substances 0.000 claims description 13
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 abstract description 26
- 238000000034 method Methods 0.000 abstract description 20
- 238000003915 air pollution Methods 0.000 abstract description 8
- 238000004887 air purification Methods 0.000 abstract description 4
- 238000005070 sampling Methods 0.000 abstract description 4
- 230000001954 sterilising effect Effects 0.000 abstract description 3
- 238000004659 sterilization and disinfection Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 5
- 239000008188 pellet Substances 0.000 description 5
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 4
- 150000001450 anions Chemical class 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005367 electrostatic precipitation Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001699 photocatalysis Effects 0.000 description 2
- 239000011941 photocatalyst Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 208000030303 breathing problems Diseases 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000002144 chemical decomposition reaction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005686 electrostatic field Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- LSDPWZHWYPCBBB-UHFFFAOYSA-N methyl mercaptane Natural products SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Abstract
The utility model discloses a preferential plasma purification device which comprises a controller, multiple kinds of gas and particle sensors connected into the controller, a digital direct-current controllable power source, a high-voltage power source, an air sterilization module, a plasma generator and a nanometer optical hydrogen ion air purifier. According to the preferential plasma purification device, a closed-loop control loop is formed by the various kinds of gas and particle sensors, the controller and external execution devices; the air pollution index is judged by comparing a current air sampling value and a value in the national standard, and a corresponding air purification method is preferentially selected; then according to the measured ozone concentration, output power of the digital direct-current controllable power source is changed, and the ozone concentration is dynamically controlled to be kept within the optimal range in the national standard.
Description
Technical field
The utility model relates to gas cleaning plant field, is specially a kind of preferably plasma purification device.
Background technology
Along with social development and the enhancing of environmental consciousness, the requirement of the air quality of people to own living environment is also more and more higher.But along with development, the quickening of Urbanization Construction paces and the construction of infrastructure of urban industry, air pollution is also further serious.Volatile organic matter matter (VOC, as formaldehyde, toluene, dimethylbenzene etc.), pellet (PM2.5, PM10), ozone content, Air colony sum become the important indicator of evaluating IAQ.
In such environment, reduce ventilation even if close window, the pellets such as gaseous material and dust such as the bacterium that assembles in air, virus, peculiar smell molecule, VOC not only produce niff, and make air become dirty, easily cause breathing problem, infection and Other diseases, people's health is caused and had a strong impact on.
Central air conditioner system belongs to interior circulation, though screen pack is installed, can only filter the dust that particle diameter is larger, does not have air-cleaning function.Indoor air exchange system is taken a breath in the time that air pollution is serious, will make IAQ decline, and increase energy consumption.
Existing market gas purifier kind is more.With regard to its basic functional principle, mainly comprise conventional filtration absorbent-type, electrostatic precipitation type, anion and plasma for purification, ultraviolet light and the nano photo-catalytic type etc. that combines.Under the various complicated situation of pollution sources now, single technology is often difficult to meet the requirement of air cleaning.Conventionally electrostatic precipitation, anion (plasma), ultraviolet and several technology of photocatalyst are combined, to strengthen its collaborative effect of administering.Each assembly of air purifier is conventionally in continuous duty, and some assembly has certain service life as anion (plasma) generator, ultraviolet and light catalyst element, and continuous operation will cause the increase of operation and maintenance expense.Although now also have by sensor and monitor air quality, just work or stop by monitoring the each assembly of simple control air purifier simultaneously.In practical application, air quality is dynamic change, such as air quality can be closed clarifier when better; And in the time of a certain index exceeding standard of air quality, can Dynamic Selection some assembly and obtain equally best clean-up effect targetedly.In the time of plasma (anion) and light catalyst element work, will have ozone generating in addition, ozone concentration is also the strict parameter of controlling of GB, therefore needs dynamically to control ozone concentration according to selected assembly, makes air quality reach GB.
Therefore need a kind of preferably plasma purification device and control method, indices that can dynamic monitoring air quality, and according to real-time Air Quality, optimizing corresponding clean air package processes, control ozone concentration simultaneously, with meet people to air cleaning environmental protection, energy-conservation, efficiently, demand easily.
Utility model content
The purpose of this utility model is to provide a kind of preferably plasma purification device, to realize the object of air cleaning.
In order to achieve the above object, the technical scheme that the utility model adopts is:
A kind of preferably plasma purification device, it is characterized in that: include controller, and the gas of multiple access controller and particle sensor, also include digital DC controllable electric power, high voltage source, air sanitizer module, plasma generator, nanometer optical hydrogen ion air clarifying device, described digital DC controllable electric power is connected with controller, and digital DC controllable electric power supplies power to high voltage source, described air sanitizer module, plasma generator is powered by high voltage source respectively, excite air sanitizer module by high voltage source with different high-voltage signals, plasma generator, described nanometer optical hydrogen ion air clarifying device access controller is by controller control.
The preferred plasma purification device of described one, is characterized in that: described gas and particle sensor comprise O
3sensor, inhalable particles sensor, VOC and NH
3sensor, SO
2with NO
2sensor.
The preferred plasma purification device of described one, it is characterized in that: described air sanitizer module is made up of the woven wire of the similar sponge of structure, silk screen surface has little pointed projections, and silk screen inside is with micropore, and the high direct voltage of high voltage source output is connected on woven wire.
The preferred plasma purification device of described one, is characterized in that: output is connected described plasma generator electrode with high voltage source, and digital DC power supply can be controlled the output voltage of high voltage source.
The preferred plasma purification device of described one, is characterized in that: described digital DC controllable electric power is connected with high voltage source by controllable silicon, and controllable silicon access controller, and described nanometer optical hydrogen ion air clarifying device is by controllable silicon access controller.
The utility model adopts all kinds of gas and particle sensor, controller, outside execution unit to form close loop control circuit.Compare according to current air sampling value and GB, judge air pollution index, optimize corresponding air purification method.Then according to the ozone concentration of measuring, change digital DC power supply out-put supply, dynamically control ozone concentration, make it to maintain in the scope of GB the best.So, reach air purification effect, and don't produce secondary pollution.
Brief description of the drawings
Fig. 1 is the utility model structural principle block diagram.
Fig. 2 is the utility model topology layout figure.
Detailed description of the invention
As shown in Figure 1.A kind of preferably plasma purification device, include controller, and the gas of multiple access controller and particle sensor, also include digital DC controllable electric power, high voltage source, air sanitizer module, plasma generator, nanometer optical hydrogen ion air clarifying device, described digital DC controllable electric power is connected with controller, and digital DC controllable electric power supplies power to high voltage source, described air sanitizer module, plasma generator is powered by high voltage source respectively, excite air sanitizer module by high voltage source with different high-voltage signals, plasma generator, described nanometer optical hydrogen ion air clarifying device difference access controller is by controller control.
Gas and particle sensor comprise O
3sensor, inhalable particles sensor, VOC and NH
3sensor, SO
2with NO
2sensor.
Air sanitizer module is made up of the woven wire of the similar sponge of structure, and silk screen surface has little pointed projections, and silk screen inside is with micropore, and the high direct voltage of high voltage source output is connected on woven wire.
Output is connected plasma generator electrode with high voltage source.
Digital DC controllable electric power is connected with high voltage source by controllable silicon, and controllable silicon access controller, and described nanometer optical hydrogen ion air clarifying device is by controllable silicon access controller.
The utility model is made up of air sanitizer module, plasma generator, nanometer optical hydrogen ion air clarifying device, and each module can work independently under the control of controller also can concurrent working.Compare according to current air sampling value and GB, judge air pollution index, optimize corresponding air-purifying module and process.During due to each module work, all can produce ozone, according to the ozone concentration of measuring, change digital DC electric power output voltage, dynamically control ozone concentration, make it to maintain in the scope of GB the best.
Its working method of the utility model comprises the following steps:
1. start, system is moved in acquiescence mode.
2. compare according to measurement value sensor and GB, judge air pollution degree, and optimize corresponding plasma purifying method.
2.1 air qualities are excellent, only open air sanitizer module
2.2 sulfur dioxide or nitrogen dioxide exceed standard, and start air exchange system.
2.3 PM10, PM2.5 exceed standard: start air sterillization and plasma generator
2.4 VOC exceed standard: start plasma generator and nanometer optical hydrogen ion air clarifying device
2.5 many indexs exceed standard, and start air sanitizer module, plasma generator, nanometer optical hydrogen ion air clarifying device
3. optimize after different plasma purifying methods, according to the ozone concentration value of measuring, controller judges, adjusts the output of digital DC power supply, thereby changes high voltage source output, makes ozone concentration at optimum range.
3.1 N
1<Ns and N
1>=Ns-Δ N, maintains work at present state (ozone concentration the best)
3.2 N
1<Ns and N
1<Ns-Δ N(ozone concentration is on the low side), increase digital DC controllable electric power operating voltage, with hoisting power,
3.3 N1>Ns(ozone concentrations are higher), reduce digital DC controllable electric power operating voltage, further to reduce power.
4. controller starts circulation execution from second step
Air sanitizer module is made up of the woven wire of the similar sponge of structure, and silk screen surface has little pointed projections, and silk screen inside is with micropore, and micropore itself can filter the particle that particle diameter is large, and the high direct voltage of high voltage source output is connected on parallel woven wire.Under the effect of electrostatic field, can the less solid particle of adsorption particle, and kill airborne germ and remove peculiar smell.
Output is connected plasma generator electrode with high-voltage DC power supply, can produce high energy particle and each active component under the exciting of high voltage electric field.In the time that air pollution is heavier, can strengthen its clean-up effect.
Nanometer optical hydrogen ion air clarifying device is a kind of photocatalyst catalytic air purification technology, utilize special wave band ultraviolet ray, be radiated on nano photo-catalytic material, produce free radical and active particle etc., by these advanced oxidation particle ionizations, chemical decomposition pernicious gas and peculiar smell, remove particle, kill the microorgranic contaminants such as bacterium, thereby reach the effect of air cleaning.
Air sanitizer module and plasma generator are excited by different high voltage sourcies, and high voltage source is powered by digital DC controllable electric power.Controllable electric power is provided with the digital interface being connected with controller, can adjust by controller the DC voltage of output, thereby changes the power output of high voltage source.
Between the output of digital DC controllable electric power and high voltage source power supply, adopt controllable silicon to connect, silicon controlled duty is controlled by controller output.The power supply in same described nanometer optical hydrogen ion source is also connected by controllable silicon, and silicon controlled duty is controlled by controller output.
As shown in Figure 2, the preferred plasma purification device of the utility model comprises air inlet 7 and air outlet 8, is disposed with air sanitizer module 2, plasma generator 3, nanometer optical hydrogen ion air clarifying device 4 and blower fan 5 between air inlet and air outlet.Air inlet and air outlet place are provided with interface 1,6, can be connected with VMC with central air conditioner system easily.This device also can be combined into as air purifier independently with control system.
The each module of the utility model can work alone under controller control also can combine concurrent working.Compare by various gas and particle sensor sampled value and GB, judge air pollution index, optimize different air-purifying modules and process.During due to each module work, all can produce ozone, according to the ozone concentration gathering, change digital DC electric power output voltage, dynamically control ozone concentration, make it to maintain in the scope of GB the best.
Embodiment mono-: process pellet (room air pellet standard GB/T17095)
In simulation laboratory, quantitative printer ink powder is distributed in test space, to simulate the pellet situation that exceeds standard, adopt impacting type weight method to obtain space initial concentration.
Adopt the control method of preferred plasma purification device of the present utility model, sensor detects that particle exceeds standard, and optimizes air sanitizer module 2 and plasma generator 3 concurrent workings.Adopt this method work 24 hours particle content in sampled air again.Its content drops to 0.04 mg/L by 1.00 initial mg/L, and resolution ratio reaches 96%.In duration of test sensor dynamic monitoring air quality, when particle content is during lower than national standard 0.15 mg/L, controller switching operational module, only preferably an air sanitizer module 2 is carried out work.According to the ozone concentration detecting, dynamically adjust the power output of high voltage source simultaneously, ozone concentration is controlled in GB.Therefore this method can be according to the dynamic change of air quality, and preferably corresponding processing module reaches optimization process effect simultaneously.There are efficient, energy-saving and environmental protection, be easy to the feature safeguarded.
Embodiment bis-: process VOC and gas with foreign flavor
In simulation laboratory, will in formalin, benzene, methyl mercaptan solution (solution used is and analyzes pure solution), ammonia solution, distinctly be put in surface plate, and its initial concentration of then sampling for 12 hours that volatilizees in space.Relevant criterion is according to GB/18883-2002, GB/T 18204.25-2000, GB/T 18204. 26-2000, GB 11737-89.
Adopt the control method of preferred plasma purification device of the present utility model, sensor detects that ammonia and VOC exceed standard, and optimizes plasma generator 3 and 4 concurrent workings of nanometer optical hydrogen ion air clarifying device.Adopt this method work 24 hours corresponding pollutant load in sampled air again, and obtain its degradation rate.Within 24 hours, degradation rate all reaches more than 91.5%.In duration of test sensor dynamic monitoring air quality, when pollutant load is during lower than national standard, controller switching operational module, only preferably an air sanitizer module 2 is carried out work.Duration of test, according to the ozone concentration detecting, is dynamically adjusted the power output of high voltage source simultaneously, and ozone concentration is controlled in GB.
Embodiment tri-: BA
First in simulation laboratory, adopt this device to detect air quality, indices is all up to state standards.Adopt shock method GB/T 18204.1-2000 to obtain initial clump count in air.
Adopt the control method of preferred plasma purification device of the present utility model, sensor detects that air quality is all up to state standards.Preferably air sanitizer module 2 is worked 24 hours, then measures the total number of bacteria of air, and obtains sterilizing rate.More than within 24 hours, sterilizing rate reaches 99 %.In duration of test sensor dynamic monitoring air quality, and preferably corresponding module walks abreast or works independently.Duration of test, according to the ozone concentration detecting, is dynamically adjusted the power output of high voltage source simultaneously, and ozone concentration is controlled in GB.
The above embodiment is described preferred embodiment of the present utility model; not scope of the present utility model is limited; do not departing under the prerequisite of the utility model design spirit; various distortion and improvement that the common engineers and technicians in this area make the technical solution of the utility model, all should fall in the definite protection domain of claims of the present utility model.
Claims (5)
1. a preferred plasma purification device, it is characterized in that: include controller, and the gas of multiple access controller and particle sensor, also include digital DC controllable electric power, high voltage source, air sanitizer module, plasma generator, nanometer optical hydrogen ion air clarifying device, described digital DC controllable electric power is connected with controller, and digital DC controllable electric power supplies power to high voltage source, described air sanitizer module, plasma generator is powered by high voltage source respectively, excite air sanitizer module by high voltage source with different high-voltage signals, plasma generator, described nanometer optical hydrogen ion air clarifying device access controller is by controller control.
2. the preferred plasma purification device of one according to claim 1, is characterized in that: described gas and particle sensor comprise O
3sensor, inhalable particles sensor, VOC and NH
3sensor, SO
2with NO
2sensor.
3. the preferred plasma purification device of one according to claim 1, it is characterized in that: described air sanitizer module is made up of the woven wire of the similar sponge of structure, silk screen surface has little pointed projections, silk screen inside is with micropore, and the high direct voltage of high voltage source output is connected on woven wire.
4. the preferred plasma purification device of one according to claim 1, is characterized in that: output is connected described plasma generator electrode with high voltage source, and digital DC power supply can be controlled the output voltage of high voltage source.
5. the preferred plasma purification device of one according to claim 1, it is characterized in that: described digital DC controllable electric power is connected with high voltage source by controllable silicon, and controllable silicon access controller, described nanometer optical hydrogen ion air clarifying device is by controllable silicon access controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420098764.4U CN203757957U (en) | 2014-03-05 | 2014-03-05 | Preferential plasma purification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420098764.4U CN203757957U (en) | 2014-03-05 | 2014-03-05 | Preferential plasma purification device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203757957U true CN203757957U (en) | 2014-08-06 |
Family
ID=51253220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420098764.4U Expired - Lifetime CN203757957U (en) | 2014-03-05 | 2014-03-05 | Preferential plasma purification device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203757957U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104296317A (en) * | 2014-09-29 | 2015-01-21 | 珠海格力电器股份有限公司 | Controlling method and device of air purifier |
| CN106647834A (en) * | 2016-12-28 | 2017-05-10 | 中科益盛科技有限公司 | Automated management system |
| CN114340129A (en) * | 2022-01-06 | 2022-04-12 | 成都万物之成科技有限公司 | Hydrated plasma generator, air sterilizing device, air sterilizing control system and control method |
-
2014
- 2014-03-05 CN CN201420098764.4U patent/CN203757957U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104296317A (en) * | 2014-09-29 | 2015-01-21 | 珠海格力电器股份有限公司 | Controlling method and device of air purifier |
| CN104296317B (en) * | 2014-09-29 | 2017-02-15 | 珠海格力电器股份有限公司 | Controlling method and device of air purifier |
| CN106647834A (en) * | 2016-12-28 | 2017-05-10 | 中科益盛科技有限公司 | Automated management system |
| CN114340129A (en) * | 2022-01-06 | 2022-04-12 | 成都万物之成科技有限公司 | Hydrated plasma generator, air sterilizing device, air sterilizing control system and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140806 |
|
| CX01 | Expiry of patent term |