CN203376235U - Device applicable to measuring concentration of PM (Particulate Matter) 2.5 on line in air purifier - Google Patents
Device applicable to measuring concentration of PM (Particulate Matter) 2.5 on line in air purifier Download PDFInfo
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- CN203376235U CN203376235U CN201320460393.5U CN201320460393U CN203376235U CN 203376235 U CN203376235 U CN 203376235U CN 201320460393 U CN201320460393 U CN 201320460393U CN 203376235 U CN203376235 U CN 203376235U
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Abstract
The utility model relates to a device applicable to measuring concentration of PM (Particulate Matter) 2.5 on line in an air purifier. The PM2.5 measuring device is arranged on a part, passing through a primary filter screen, of an air purifying part in a machine body, and consists of a PM2.5 filter screen, a plurality of laser generators with different wavelengths, a lens, a diaphragm, a spectroscope, a photoelectric detector, a multi-channel amplifying circuit, a 4-20mA signal isolating converter, an A/D (Analog to Digital) converter, a single chip microcomputer system, and an LED (Light-Emitting Diode) display screen; particulate matters in air are separated by filtering twice through the primary filter screen and the PM2.5 filter screen, so that particles with diameters being larger than 2.5 mu m are blocked on the filter screens, and particles with diameters being less than 2.5 mu m enter a measuring region, and a measuring object is locked within a PM2.5 range; an average particle size of PM2.5 and quantity of PM2.5 in unit volume are measured by adopting a double-wavelength light pulse device, and then concentration of PM2.5 is calculated. The device disclosed by the utility model can be used for measuring concentration of indoor PM2.5 at any time and displaying the measured concentration on a display screen, and can automatically alarm if the concentration exceeds the standards.
Description
Technical field
The utility model relates to a kind of on-line measurement PM in air purifier that is applicable to
2.5the device of concentration, particularly a kind ofly meet the concrete measurement environment of indoor air cleaner and demand, and by installation cost low PM
2.5apparatus for measuring concentration.
Background technology
Along with China's industry and expanding economy, problem of environmental pollution is also more and more outstanding, before and after 2013, haze sweeps across more than half China, air quality extremely worsens, and people pollute very frightened to haze, add the appearance of influenza and new virus H7N9, make the numerous common people more and more higher to demand and the cry of safety, healthy air environment, therefore air purifier also starts to come into huge numbers of families.Air pollutants have many types, mainly comprise particle, gaseous contaminant, harmful microorganism, wherein again with particle PM
2.5pollution and harm the most serious.Present PM
2.5become the primary pollutant of China's urban air, this class particle is the main cause that atmospheric visibility reduces, and is the arch-criminal of haze; Be easy to adsorb poisonous heavy metal, organic contaminant, virus, bacterium etc. simultaneously, can enter human body by respiratory system, cause various diseases, be the inducement occurred frequently of lung cancer, and affect fetus and child development, people's physical and mental health is subject to serious threat.Therefore, develop and a kind ofly possess air-cleaning function and contain PM
2.5the Household Air Purifier of concentration monitor device is very necessary.
The air purifier kind of existing market is numerous and diverse, all declares to remove fine particle PM
2.5but removal effect is not that our naked eyes are visible also or other sense organ energy perception, can people to deviate from PM actually
2.5how many ratios that perhaps can remove also have suspection, although there is the part air purifier that dust sensor is housed, dust sensor does not possess PM
2.5specific aim also can only roughly be responded to the dust concentration variation, and sensor can only provide very coarse particle information by pilot lamp, can't measure the PM that the user is concerned about most
2.5concentration, and so-called dust sensor do not obtain authoritative department checking yet, can not guarantee degree of accuracy.People wish a kind of air purifier, when purifying air, and accurate PM in the on-line measurement air
2.5concentration, and price can not be too expensive.But can meet this demand without any a kind of air purifier at present, therefore develop on-line measurement PM in a kind of air purifier
2.5the device of concentration is to meet very much the mass psychology demand.
Because air purifier is a kind of household electrical appliance, so PM
2.5the cost of apparatus for measuring concentration can not be too high.The optical scatter measuring technique contains multiple particle sizing method and in industrial existing application, but if directly industrial measurement mechanism is transplanted to the PM in air purifier
2.5measurement of concetration is very inappropriate, because they do not have measurement environment and demand for air purifier, and uses the expensive device such as special polynary photodetector, spectrometer and measures particle size distribution.And air purifier does not need an only needs measurement average case of side particle diameter distribution, and require to reduce as far as possible installation cost.So develop and a kind ofly both can record PM
2.5the concentration relatively low method and apparatus of cost again is crucial.
The utility model content
For the problems referred to above, the utility model provides a kind of on-line measurement PM in air purifier that is applicable to
2.5the device of concentration, particularly a kind ofly meet the concrete measurement environment of indoor air cleaner and demand, and the lower PM of installation cost
2.5apparatus for measuring concentration.
The utility model to achieve these goals, can be used following scheme:
<scheme 1 >
The utility model provides a kind of on-line measurement PM in air purifier that is applicable to
2.5the device of concentration, survey PM online
2.5the device of concentration is placed in the position after just imitating filter screen in body, be divided into laser emitting region, measurement zone and signal reception & disposal district, it is characterized in that having: two laser generators, there is different wavelength, be respectively the first laser generator and the second laser generator, four lens, two diaphragms, PM
2.5filter screen, two spectroscopes, two photodetectors, the hyperchannel amplifying circuit, 4～20mA signal isolating converter, the A/D analog to digital converter, Single Chip Microcomputer (SCM) system, and LED display, wherein, measurement zone separates out laser emitting region and signal reception & disposal, form parallel monochromatic light after the lens calibration that the laser of the first and second laser generator emissions arranges through pair of parallel respectively, then distinguishing a pair of diaphragm of parallel process limits, and shining measurement zone from laser emitting region after spectroscope 5:5 light splitting, measurement zone is provided with PM
2.5filter screen filters airborne bulky grain thing, through first effect filter screen and the PM of laser emitting region
2.5after filter screen isolation bulky grain, only contain PM in measurement zone
2.5particle, shine the two-beam of measurement zone through PM
2.5particle transmission and decaying, from the two-beam of the decay of measurement zone outgoing entering signal reception & disposal district respectively after another carries out delustring to the lens that be arranged in parallel, then by the photodetector of two parallel placements, recorded, the light intensity signal received through photodetector is converted respectively to corresponding electric signal, then through amplifying circuit, signal is amplified successively, the signal conversion of 4～20mA signal isolating converter, and the A/D analog to digital converter is transformed into digital signal by signal, send into storage and calculating in single-chip microcomputer, irradiate with the incident laser of two different wave lengths the coincidence value calculated and obtain the amounts of particles in particle mean grain size and unit volume, and then calculate PM
2.5concentration, and by PM
2.5the concentration curve plotting is presented on LED display.
The on-line measurement PM that the utility model is related
2.5the device of concentration, the PM of demonstration
2.5concentration curve is a time dependent curve of cyclical fluctuations, on the curve of cyclical fluctuations, except the instantaneous data of display measurement, also shows this time point PM of front some time
2.5concentration.
Further, be provided with PM in Single Chip Microcomputer (SCM) program
2.5concentration standard, when recording indoor PM
2.5can automatic alarm during concentration over-standard.
<scheme two >
The utility model provides a kind of on-line measurement PM in air purifier that is applicable to
2.5the device of concentration, on-line measurement PM
2.5the device of concentration is placed in the position after just imitating filter screen in body, be divided into laser emitting region, measurement zone and signal reception & disposal district, it is characterized in that having: the laser generator of three different wave lengths is respectively the first laser generator, the second laser generator and the 3rd laser generator; Six lens; Three diaphragms that be arranged in parallel; PM
2.5filter screen; Three spectroscopes that be arranged in parallel; Six are two groups of photodetectors that be arranged in parallel; The A/D analog to digital converter; Single Chip Microcomputer (SCM) system; And LED display forms; Wherein, measurement zone separates out laser emitting region and signal reception & disposal, the laser that first, second and the 3rd laser generator are launched forms parallel monochromatic light respectively after three lens calibrations that be arranged in parallel, then parallelly respectively through three diaphragms that be arranged in parallel, limit, and shine measurement zone from laser emitting region after three spectroscope 5:5 light splitting that be arranged in parallel, output intensity is recorded by one group of three photodetector that be arranged in parallel in laser emitting region after light splitting, and measurement zone is provided with PM
2.5filter screen by airborne bulky grain thing separately, is imitated filter screen and PM through just
2.5after filter screen isolation bulky grain, only contain PM in measurement zone
2.5particle, shine the three-beam of measurement zone through PM
2.5particle transmission and decaying, from the three-beam of the decay of measurement zone outgoing entering signal reception & disposal district respectively after three lens that be arranged in parallel of another group carry out delustring, then by the photodetector of three parallel placements of another group, recorded, the light intensity signal received through photodetector is converted respectively to corresponding electric signal, then through the A/D analog to digital converter, signal is transformed into to digital signal, send into storage and calculating in single-chip microcomputer, calculate the amounts of particles in particle mean grain size and unit volume, and then calculate PM
2.5concentration, and by PM
2.5the concentration curve plotting is presented on LED display.
The on-line measurement PM that the utility model is related
2.5the device of concentration, the PM of demonstration
2.5concentration curve is a time dependent curve of cyclical fluctuations, on the curve of cyclical fluctuations, except the instantaneous data of display measurement, also shows this time point PM of front some time
2.5concentration.
Further, be provided with PM in Single Chip Microcomputer (SCM) program
2.5concentration standard, when recording indoor PM
2.5can automatic alarm during concentration over-standard.
The accompanying drawing explanation
Fig. 1 is based on the on-line measurement PM of dual wavelength light pulsation
2.5the apparatus structure schematic diagram of concentration.
Fig. 2 is based on the on-line measurement PM of three-wavelength delustring
2.5the apparatus structure schematic diagram of concentration.
Fig. 3 is the PM shown on the body LED display
2.5the concentration monitor master drawing.
The effect of utility model and effect
The utility model on-line measurement PM
2.5the device of concentration adopts the dual wavelength light pulsation first, or the indoor PM of three-wavelength delustring on-line measurement
2.5concentration, at first be that Particulate Matter in Indoor Air is carried out to separating treatment, on the basis of light pulsation principle, the employing dual-wavelength laser irradiates, or adopt the three-wavelength Ear Mucosa Treated by He Ne Laser Irradiation, and on the basis of delustring principle, the signal recorded according to photodetector, be input in single-chip microcomputer after signal amplification and analog to digital conversion, by the program according to light pulsation principle or light scattering principle design in single-chip microcomputer, calculate PM
2.5concentration, obtain result accurately, and installation cost is lower.The user can intuitively see current PM expressly
2.5effect after situation and air purification.
Embodiment
What below in conjunction with accompanying drawing, the utility model is related to a kind ofly is applicable to on-line measurement PM in air purifier
2.5the preferred embodiment of the device of concentration elaborates, but the utility model is not limited only to this embodiment.In order to make the public have thoroughly and understand the utility model, in following the utility model preferred embodiment, describe detail in detail.
Embodiment 1:
Fig. 1 is the on-line measurement PM based on the dual wavelength light pulsation
2.5the apparatus structure schematic diagram of concentration.
As shown in Figure 1, the on-line measurement PM based on the dual wavelength light pulsation
2.5the device 100 of concentration is divided into laser emitting region and signal reception & disposal district, and the particle Processing for removing is carried out in two zones at first, guarantees not have in zone the interference of particle, and opening part all posts the HEPA filter screen, and preventing in air that particle enters affects test result.On-line measurement PM based on the dual wavelength light pulsation
2.5the device 100 of concentration is by PM
2.5filter screen 1-1, the first laser generator 1-2, the second laser generator 1-3, there is respectively the laser of emission different wave length and be arranged in parallel, the lens 1-4 be arranged in parallel in twos, totally four, two the diaphragm 1-5 be arranged in parallel, two spectroscope 1-6 that be arranged in parallel, two photodetector 1-7 that be arranged in parallel, hyperchannel amplifying circuit 1-8,4～20mA signal isolating converter 1-9, A/D analog to digital converter 1-10, single-chip microcomputer computing system 1-11, LED display 1-12 form.Dust laden air with certain speed is imitated HEPA filter screen and PM through just
2.5after filter screen 1-1 filters, larger particle is because motional inertia is large, hits on filter screen and caught PM by filter screen
2.5because the quality volume is all very little, inertia is also little, can pass through smoothly PM
2.5filter screen 1-1, PM
2.5filter screen 1-1 is arranged on the inlet end of measurement zone, and air is through PM
2.5the bulky grain that filter screen 1-1 enters measurement zone is filtered, and therefore, only contains PM in measurement zone 1-13
2.5.Measurement zone 1-13 volume is V=L * A, and L is the laser light path, and A is measurement zone incident light velocity area of section, and by the diaphragm 1-5 decision on the left side, the area of diaphragm aperture is the incident beam area of section.The existence of cover plate 1-14, be to affect measurement in order to prevent dust laden air from entering laser instrument, also do not affect laser beam and pass through simultaneously.The laser that laser instrument 1-2,1-3 send becomes directional light after lens 1-4 focuses on, and after diaphragm 1-5 restriction and spectroscope 1-6 light splitting, from laser emitting region, shines the particle measurement zone, irradiates light intensity I
0after spectroscope 5:5 light splitting, by the photodetector 1-7 in corresponding signal reception & disposal district, recorded.Because the photoextinction of particle, transmitted light intensity can be decayed, and the transmitted light intensity I of decay is also received 1-7 by photodetector, can obtain thus transmitance T(transmitted light intensity I and irradiate light intensity I
0the ratio).The two light beams of decay occurs from measurement zone arriving signal reception & disposal district, the light intensity signal received through photodetector 1-7 is converted into corresponding electric signal, then after hyperchannel amplifying circuit 1-8 amplification, the conversion of 4～20mA signal isolating converter 1-9 signal and A/D analog-to-digital conversion device 1-10 analog to digital conversion, become digital signal, send into 1-11 in single-chip microcomputer and store and prepare calculating.Single Chip Microcomputer (SCM) system 1-11, according to the program designed in advance, calculates transmitance signal T=I/I
0, and the mean value T of T
mwith variances sigma T.And then calculate PM through the light pulsation theory
2.5the mean grain size D of particle and PM
2.5the quantity N of particle.
It is very little that the volume of measurement zone is controlled, and length is 5mm, and the granule number that flows through measurement zone presents randomness, and transmitance T also presents random fluctuation.Simultaneously, because PM
2.5particle diameter is very little, it between extinction coefficient K and D, is the many-valued corresponding relation of a fluctuating, K is the function of D simultaneously, in the situation that optical wavelength and particle refractive index are known, K is only relevant with particle diameter D, the result that an optical maser wavelength obtains while irradiating is separated for more, can't determine which solution is the D that we need to try to achieve.Incident laser device 1-2 and the 1-3 of two different wave lengths irradiate respectively, carry out twice calculating according to different through light intensity and transmitance signal, because PM in measurement zone 1-13
2.5mean grain size be well-determined, all must contain correct answer D in the result of twice calculating simultaneously, get the coincidence value all occurred in twice result of calculation and be required particle mean grain size D (in actual computation because the existence of accidental error, likely these two values are very close but not identical, can carry out related setting in program, get in this case the mean value of twice measured value).Just can calculate PM by the mean grain size D obtained and amounts of particles N
2.5concentration: C=3.14 * N * D
3* ρ/6.Wherein ρ is air PM
2.5density is known quantity.Computation process all completes in Single Chip Microcomputer (SCM) system 1-11.Result is presented on LED display 1-12.So just completed room air PM
2.5the accurate on-line measurement of concentration.
Embodiment 2:
Fig. 2 is the on-line measurement PM based on the three-wavelength delustring
2.5the apparatus structure schematic diagram of concentration.
As shown in Figure 2, based on three-wavelength delustring on-line measurement PM
2.5the device 200 of concentration also is divided into laser emitting region and signal reception & disposal district, and relevant treatment and dual wavelength light palsating equipment are basically identical.Based on three-wavelength delustring on-line measurement PM
2.5the device 200 of concentration is by PM
2.5filter screen 2-1, have laser generator 2-2, the laser generator 2-3 of different wave length and laser generator 2-4, six lens 2-5 that three is one group of setting parallel to each other, diaphragm 2-6 that three be arranged in parallel, spectroscope 2-7 that three be arranged in parallel, six be two groups, and form with three photodetector 2-8 that be arranged in parallel, A/D analog to digital converter 2-9, single-chip microcomputer computing system 2-10, LED display 2-11 in one group.Dust laden air with certain speed is imitated Hepa filter screen and PM through just
2.5filter screen 2-1 makes in measurement zone 2-12 and only contains PM after filtering
2.5, PM
2.5filter screen 2-1 is arranged on the inlet end of measurement zone.The laser of the laser generator 2-2 of three different wave lengths, laser generator 2-3 and laser generator 2-4 emission becomes parallel monochromatic light after the 2-5 standard of lens school, shine the particle measurement zone from laser emitting region after diaphragm 2-6 restriction and spectroscope 2-7 light splitting, irradiate light intensity and recorded by one group of photodetector 2-8 of laser emitting region after spectroscope 5:5 light splitting, irradiate light intensity and be respectively I
01, I
02, I
03.Because the photoextinction of particle, through the transmitted light intensity after dust laden air, can decay, the three light beams of decay occurs from measurement zone arriving signal reception & disposal district, transmitted light intensity is also received by three photodetector 2-8 that be arranged in parallel of corresponding another group respectively, and transmitted light intensity is respectively I
1, I
2, I
3signal is converted to digital signal through A/D analog to digital converter 2-9, is transferred in Single Chip Microcomputer (SCM) system 2-10 the program that single-chip microcomputer designs in advance according to the approximate formula of Lamber-Beer law and extinction coefficient, irradiation light intensity and transmitted light intensity according to measured, calculate PM
2.5mean grain size D and unit volume in quantity N.Just can calculate PM by the mean grain size obtained and granule number
2.5concentration: C=3.14 * N * D
3* ρ/6.
Fig. 3 is the PM shown on the body LED display
2.5the concentration monitor master drawing.
As shown in Figure 3, body demonstration screen display PM
2.5the concentration monitor master drawing, the horizontal ordinate of monitoring master drawing is time T, ordinate is PM
2.5concentration.Not only can see and measure PM constantly
2.5concentration, can also see the PM in measurement point for the previous period
2.5the fluctuation situation of change of concentration and the effect after air purification.Red line simultaneously is the PM that country sets
2.5concentration standard, when recording indoor PM
2.5meeting automatic alarm during concentration over-standard, the reminding user pollution situation, in order to take some countermeasures.
Claims (6)
1. one kind is applicable to on-line measurement PM in air purifier
2.5the device of concentration, described online survey PM
2.5the device of concentration is placed in the position after just imitating filter screen in body, is divided into laser emitting region, measurement zone and signal reception & disposal district, it is characterized in that having:
Two laser generators, have different wavelength, is respectively the first laser generator and the second laser generator; Four lens; Two diaphragms; PM
2.5filter screen; Two spectroscopes; Two photodetectors; The hyperchannel amplifying circuit; 4～20mA signal isolating converter; The A/D analog to digital converter; Single Chip Microcomputer (SCM) system; And LED display;
Wherein, described measurement zone separates out described laser emitting region and described signal reception & disposal, form parallel monochromatic light after the lens calibration that the laser of the first and second laser generator emissions arranges through pair of parallel respectively, then the parallel a pair of described diaphragm of process is limited respectively, and shine described measurement zone from described laser emitting region after described spectroscope 5:5 light splitting
Described measurement zone is provided with PM
2.5filter screen separates airborne bulky grain thing, through first effect filter screen and the described PM of described laser emitting region
2.5after filter screen isolation bulky grain, only contain PM in described measurement zone
2.5particle, shine the two-beam of described measurement zone through PM
2.5particle transmission and decaying enters respectively described signal reception & disposal district from the two-beam of the decay of described measurement zone outgoing after another carries out delustring to the lens that be arranged in parallel, then by the photodetector of two parallel placements, recorded,
The light intensity signal received through described photodetector is converted respectively to corresponding electric signal, then successively through described amplifying circuit by described signal amplify, the conversion of the signal of 4～20mA signal isolating converter, and the A/D analog to digital converter is transformed into digital signal by described signal, send into storage and calculating in described single-chip microcomputer, irradiate with the incident laser of two different wave lengths the coincidence value calculated and obtain the amounts of particles in particle mean grain size and unit volume, and then calculate PM
2.5concentration, and by described PM
2.5the concentration curve plotting is presented on described LED display.
2. on-line measurement PM according to claim 1
2.5the device of concentration is characterized in that:
Wherein, the described PM of demonstration
2.5concentration curve is a time dependent curve of cyclical fluctuations, on the described curve of cyclical fluctuations, except the instantaneous data of display measurement, also shows this time point PM of front some time
2.5concentration.
3. on-line measurement PM according to claim 1
2.5the device of concentration is characterized in that:
Wherein, be provided with PM in described Single Chip Microcomputer (SCM) program
2.5concentration standard, when recording indoor PM
2.5can automatic alarm during concentration over-standard.
4. one kind is applicable to on-line measurement PM in air purifier
2.5the device of concentration, described on-line measurement PM
2.5the device of concentration is placed in the position after just imitating filter screen in body, is divided into laser emitting region, measurement zone and signal reception & disposal district, it is characterized in that having:
The laser generator of three different wave lengths, be respectively the first laser generator, the second laser generator and the 3rd laser generator; Six lens; Three diaphragms that be arranged in parallel; PM
2.5filter screen; Three spectroscopes that be arranged in parallel; Six are two groups of photodetectors that be arranged in parallel; The A/D analog to digital converter; Single Chip Microcomputer (SCM) system; And LED display forms;
Wherein, described measurement zone separates out described laser emitting region and described signal reception & disposal, the laser that first, second and the 3rd laser generator are launched forms parallel monochromatic light respectively after three lens calibrations that be arranged in parallel, then parallelly respectively through three described diaphragms that be arranged in parallel, limit, and shine described measurement zone from described laser emitting region after three described spectroscope 5:5 light splitting that be arranged in parallel, output intensity is recorded by one group of three photodetector that be arranged in parallel in described laser emitting region after light splitting
Described measurement zone is provided with PM
2.5filter screen separates airborne bulky grain thing, through described just effect filter screen and described PM
2.5after filter screen isolation bulky grain, only contain PM in described measurement zone
2.5particle, shine the three-beam of described measurement zone through PM
2.5particle transmission and decaying enters respectively described signal reception & disposal district from the three-beam of the decay of described measurement zone outgoing after three lens that be arranged in parallel of another group carry out delustring, then by the photodetector of three parallel placements of another group, recorded,
The light intensity signal received through described photodetector is converted respectively to corresponding electric signal, then through described A/D analog to digital converter, described signal is transformed into to digital signal, send into storage and calculating in described single-chip microcomputer, calculate the amounts of particles in particle mean grain size and unit volume, and then calculate PM
2.5concentration, and by PM
2.5the concentration curve plotting is presented on described LED display.
5. on-line measurement PM according to claim 4
2.5the device of concentration is characterized in that:
Wherein, the described PM of demonstration
2.5concentration curve is a time dependent curve of cyclical fluctuations, on the described curve of cyclical fluctuations, except the instantaneous data of display measurement, also shows this time point PM of front some time
2.5concentration.
6. on-line measurement PM according to claim 4
2.5the device of concentration is characterized in that:
Wherein, be provided with PM in described Single Chip Microcomputer (SCM) program
2.5concentration standard, when recording indoor PM
2.5can automatic alarm during concentration over-standard.
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2013
- 2013-07-30 CN CN201320460393.5U patent/CN203376235U/en not_active Expired - Fee Related
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