CN105092443B - particulate matter measuring apparatus - Google Patents
particulate matter measuring apparatus Download PDFInfo
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- CN105092443B CN105092443B CN201510309718.3A CN201510309718A CN105092443B CN 105092443 B CN105092443 B CN 105092443B CN 201510309718 A CN201510309718 A CN 201510309718A CN 105092443 B CN105092443 B CN 105092443B
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Abstract
The invention discloses a kind of particulate matter measuring apparatus, the particulate matter measuring apparatus moves in ambient air and produces air-flow, including：First storeroom and the second storeroom relative to each other, for collecting and discharging the particulate matter of the first average grain diameter；Measuring chamber, for collecting the particulate matter of the second average grain diameter；Light source and photodetector in the measuring chamber；First gas channel, exterior space is connected with the first storeroom；Second gas channel, exterior space is connected with the second storeroom；3rd gas channel, the end of the first gas channel is connected with measuring chamber, and the 3rd gas channel is different from the bearing of trend of the first gas channel；4th gas channel, the end of the second gas channel is connected with measuring chamber, and the 4th gas channel is different from the bearing of trend of the second gas channel.The particulate matter measuring apparatus can reduce volume and improve the resolution ratio and measurement accuracy of small particle.
Description
Technical field
The present invention relates to ambient air to monitor field, more particularly to particulate matter measuring apparatus.
Background technology
With being further exacerbated by for many air pollutions, increasing city dweller starts to be concerned about the health breath with them
The air quality that manner of breathing closes.The quality of ambient air is directly connected to the quality of life of people.Such as the particulate matter meeting in air
So that people do not feel like oneself.
For pellet, particle size is different, and the depth that can enter human respiratory is also different.Larger
Particulate matter majority is delayed at the upper respiratory tract, and smaller particulate matter can then enter bronchus even alveolar.Therefore, particulate matter
It can classify by diameter.Particle diameter is referred to as TSP (Total Suspended Particle) less than 100 microns, i.e., total outstanding
Float particle.Particle diameter is referred to as PM10 less than 10 microns (PM abridges for Particulate Matter), you can suction particle
Thing.Particle diameter is referred to as PM2.5 less than 2.5 microns, you can go directly to the alveoli.
PM2.5 is alternatively referred to as " fine particle ", and its chemical composition mainly includes machine carbon (OC), elemental carbon (EC), nitric acid
Salt, sulfate, ammonium salt, sodium salt (Na+) etc..Although PM2.5 is the component that content is seldom in ambient air composition, it is right
Air quality and visibility etc. have important influence.PM2.5 particle diameters are small, and area is big, and activity is strong, easily subsidiary poisonous and harmful substances
(for example, heavy metal, microorganism etc.), and residence time length, fed distance in an atmosphere is remote, thus to health and air
The influence of environmental quality is bigger.
Particulate matter measuring apparatus can be used for ambient air monitoring field, there is provided the concentration of the particulate matter in ambient air
Information.In order to further obtain the concentration information of pellet in ambient air, particulate matter measuring apparatus is adopted including air
Sampling device and particulate matter detection means.Air sampling rig generally includes air pump, electric fan etc. so that enough air to be measured enter
Enter particulate matter measuring apparatus.Small particle can also be separated and individually examined by air sampling rig from ambient air
Survey, there is provided the special concentration information of the particle of specific footpath grain.
Because using the equipment such as air pump, existing particulate matter measuring apparatus is not only expensive, and volume is big, therefore, it is difficult to
Personal and domestic application domain is promoted.
The content of the invention
It is an object of the invention to provide a kind of particulate matter measuring apparatus that can reduce volume and improve measurement accuracy
And its measuring method.
According to the present invention, there is provided a kind of particulate matter measuring apparatus, the particulate matter measuring apparatus ambient air move and
Air-flow is produced, including：First storeroom and the second storeroom relative to each other, for collecting and discharging of the first average grain diameter
Grain thing；Measuring chamber, for collecting the particulate matter of the second average grain diameter, wherein the second average grain diameter is less than the first average grain diameter；Position
Light source and photodetector in the measuring chamber, the light source and the photodetector are each other in angle to detect by
Scattering light caused by the particulate matter of two average grain diameters；First gas channel, exterior space is connected with the first storeroom；Second gas
Circulation road, exterior space is connected with the second storeroom；3rd gas channel, the end of the first gas channel and measuring chamber are connected
It is logical, and the 3rd gas channel is different from the bearing of trend of the first gas channel；4th gas channel, by the second gas channel
End connects with measuring chamber, and the 4th gas channel is different from the bearing of trend of the second gas channel.
Preferably, the particulate matter measuring apparatus also includes first component and the second component above first component,
Measuring chamber is wherein formed in first component, the first storeroom and the second storeroom, and first are formed in second component
Part and second component limit the first gas channel, the second gas channel, the 3rd gas channel and the 4th gas channel together.
Preferably, first component and second component are by one kind in plastics, glass, semiconductor, aluminium alloy, stainless steel
Material forms.
Preferably, at least a portion side wall of measuring chamber is more than 90 degree relative to the angle of the bottom of measuring chamber.
Preferably, the 3rd gas channel and the respective at least a portion side wall of the 4th gas channel relative to measuring chamber bottom
The angle in portion is more than 90 degree.
Preferably, the particulate matter measuring apparatus also includes：5th gas channel, by the end of the first gas channel and outside
Portion space connects, and the 5th gas channel is identical with the bearing of trend of the 3rd gas channel；And the 6th gas channel, by
The end of two gas channels connects with exterior space, and the 6th gas channel is identical with the bearing of trend of the 4th gas channel.
Preferably, the particulate matter measuring apparatus also includes：3rd storeroom and the 4th storeroom, for collecting and discharging
The particulate matter of 3rd average grain diameter, wherein, the 3rd storeroom connects with the middle part of the 3rd gas channel, the 4th storeroom and the 4th
The middle part connection of gas channel, also, the 3rd average grain diameter is less than the first average grain diameter and is more than the second average grain diameter.
Preferably, the particulate matter measuring apparatus also includes the third member below the first component, and using the
Three-parts configuration is into the multiple gas channels corresponding with first component and multiple storerooms.
Preferably, the particulate matter measuring apparatus also includes interface channel, and the first storeroom and the second storeroom are connected,
And the sectional area of interface channel is less than the sectional area of the first gas channel and the second gas channel.
Preferably, the particulate matter measuring apparatus also includes the light shield relative with light source, for absorbing the direct projection of light source
Light.
Preferably, the light source is LED array light source.
Preferably, the photodetector is photodiode.
According to the particulate matter measuring apparatus of the present invention, fan is replaced to produce air-flow using the motion of particulate matter measuring apparatus.
Due to the moving parts such as fan need not be used in measurement apparatus, therefore the volume of measurement apparatus can be reduced, reduce noise,
Reliability is improved, and is easily integrated with portable equipments such as mobile phones.Difference can be separated by the design of gas channel
The particulate matter of particle diameter so that measuring chamber mainly collects small particle, therefore can improve particulate matter measuring apparatus resolution ratio and
Measurement accuracy.
Brief description of the drawings
Fig. 1 a, 1b and 1c show the schematic perspective view of the particulate matter measuring apparatus according to the first embodiment of the present invention, shown
The top view of meaning property sectional view and a part；
Fig. 2 shows the schematic sectional view of particulate matter measuring apparatus according to the second embodiment of the present invention；
Fig. 3 shows the schematic sectional view of particulate matter measuring apparatus according to the third embodiment of the invention；
Fig. 4 shows the schematic sectional view of particulate matter measuring apparatus according to the fourth embodiment of the invention；
Fig. 5 shows the schematic sectional view of particulate matter measuring apparatus according to the fifth embodiment of the invention；
Fig. 6 shows the schematic sectional view of particulate matter measuring apparatus according to the sixth embodiment of the invention；And
Fig. 7 shows the schematic sectional view of particulate matter measuring apparatus according to the seventh embodiment of the invention.
Embodiment
Following discloses provide many different embodiments or example to implement the different characteristic of the application.Describe below
Part or the specific embodiment of arrangement are to simplify the present invention.Certainly, these are only that example is not intended to limit the present invention.
In addition, in the specification and in the claims, term " first ", " second " etc. are used to carry out between analogous element
Distinguish, and if the order of time sequencing, spatial order, hierarchal order or any other mode may not be described, should be appreciated that
These terms used are interchangeable under appropriate environment, and embodiments of the invention described herein can be to be described herein
Or other beyond showing sequentially operate.
It should be noted that the term " comprising " used in detail in the claims should not be construed as limited to hand listed below
Section, it is not precluded from other elements or step.Thus, it should be interpreted specify such as relating to the feature, numeral, step
Or the presence of part, but it is not excluded that the presence of one or more other features, numeral, step or parts or its combination
Or addition.Therefore, the scope of word " equipment for including device A and B " should not be limited to the device being only made up of component A and B.
This means for the present invention, the associated component of equipment is A and B.
This specification in the whole text in reference to " one embodiment " or " embodiment " mean that combining the embodiment describes
Special characteristic, structure or characteristic include at least one embodiment of the present invention in.Thus, everywhere occur in specification
Phrase " in one embodiment " is not necessarily all referring to the same embodiment " in embodiment ", but may be so.In addition, root
Disclosed according to the present invention it will be readily apparent to one skilled in the art that in one or more embodiments, special characteristic, knot
Structure or characteristic can combine in any suitable manner.
Similarly, it will be appreciated that the present invention exemplary embodiment description in, in make the present invention disclose smoothness and
Help to understand the purpose of the one or more aspects in terms of each invention, each feature of the invention is grouped in together sometimes
In single embodiment, accompanying drawing or description to embodiment and accompanying drawing.However, the disclosure method is not necessarily to be construed as reflecting institute
Claimed invention needs the intention of the more features than being expressly recited in each claim.On the contrary, such as following right
It is required that reflection, it is in terms of invention, it is fewer than all features of single embodiments disclosed above.Thus, specific embodiment party
Claim after formula is expressly incorporated into the embodiment, and wherein each claim independently represents Ben Fa
A bright single embodiment.
In addition, although this time some embodiments of description include some features included in other embodiment but without them
Other features that his embodiment includes, the combination of the feature of different embodiments is intended to fall within the scope of the present invention, and shape
Into by by skilled artisan understands that different embodiments.For example, in the following claims, required embodiment
In any one can be in any combination.
It should be noted that used particular term should not be recognized when describing particularly unique feature of the present invention or aspect
To be to imply that the term is this time redefined to be limited to include the of the invention feature associated with this term or side
Any particular characteristics in face.
In the description of this offer, multiple details are elaborated.It should be appreciated, however, that embodiments of the invention do not have
Put into practice in the case of these details.In other embodiments, in order to without prejudice to understanding of this description, not show in detail
Go out known method, structure and technology.
The present invention can be presented in a variety of manners, some of examples explained below.
Reference picture 1a, 1b and 1c, the particulate matter measuring apparatus according to the first embodiment of the present invention is described.Fig. 1 a are shown
The schematic perspective view of grain thing measurement apparatus, Fig. 1 b show sectional view of the particulate matter measuring apparatus along the line AA in Fig. 1 a, and
Fig. 1 c show that particulate matter measuring apparatus removes the top view after the second component on top.
The particulate matter measuring apparatus includes being located at first component 100 and the second component above first component 100
200.First component 100 and second component 200 are made up of any material that can limit spatial form, such as plastics, glass, half
Conductor, aluminium alloy, stainless steel etc..
The first storeroom 321, the second storeroom 322 are formed in second component 200, is formed and surveyed in first component 100
Measure room 360.First component 100 and second component 200 limit the first gas channel 311, the second gas channel the 312, the 3rd together
Gas channel 351, the 4th gas channel 352.First gas channel 311 connects with the first storeroom 321, the second gas channel
312 connect with the second storeroom 322.In addition, the first gas channel 311 connects via the 3rd gas channel 351 with measuring chamber 360
Logical, the second gas channel 312 connects via the 4th gas channel 352 with measuring chamber 360.3rd gas channel 351 and the first gas
The bearing of trend of circulation road 311 is different, and the 4th gas channel 352 is different from the bearing of trend of the second gas channel 312, so as to change
Gas flow direction is become so that gas-flow resistance increase.
At work, particulate matter measuring apparatus moves in ambient air, due to particulate matter measuring apparatus and ambient air
Relative motion and produce air-flow.For example, in Fig. 1 b, the direction of motion of particulate matter measuring apparatus is as shown in big arrow, air-flow
Direction is then as illustrated by small arrows.If the direction of motion on the contrary, if airflow direction invert.
In the example shown in Fig. 1 b, the Part I of air-flow enters the from exterior space via the first gas channel 311
One storeroom 321, Part II enter exterior space, and the 3rd from the second storeroom 322 via the second gas channel 312
Divide the exterior space from side successively via the first gas channel 311, the 3rd gas channel 351, measuring chamber 360, the 4th air-flow
The gas channel 312 of passage 352 and second reaches the exterior space of opposite side.
Because gas-flow resistance is different, the first average grain is collected and discharged respectively to the first storeroom 321 and the second storeroom 322
The particulate matter in footpath, measuring chamber 360 collect the particulate matter of the second average grain diameter, wherein the second average grain diameter is less than the first average grain
Footpath.Small particle in ambient air is easier to suck in measuring chamber 360 than bulky grain, so as to by small in air
Grain thing separates with bulky grain.As a result, small particle is mainly captured in measuring chamber 360.
Further, show that particulate matter measuring apparatus removes the top view after the second component 200 on top in Fig. 1 c.
As described above, measuring chamber 360 is formed in first component 100.Light source 110, relative with light source 110 can be set in measuring chamber
Light shield 120 and photodetector 130 with the direction of illumination of light source 110 into angle.Light source is LED array light source, energy
Amount is evenly distributed, it may include the light source of different colours.For small particle, infrared light supply is preferable, can be obtained higher
Sensitivity.After particulate matter scattering in the measured room 360 of light sent from light source 110, photodetector 130 is reached.Shading
Cover 120 absorbs the direct light of light source 110, to reduce adverse effect of the direct light to measurement result.
In measuring chamber, the density of particulate matter is higher, and the light sent from light source 110 reaches the intensity of photodetector 130
It is lower.As a result, the measured value of photodetector 130 represents the concentration in measuring chamber.It is small due to mainly being captured in measuring chamber 360
Particulate matter, therefore, measured value mainly represent the concentration of small particle.
Although describe first component 100 in the above-described embodiment and second component 200 be separation part, this hair
Bright not limited to this., can be by molding work in order to form the measuring chamber of gas channel, the storeroom of bulky grain thing and small particle
First component 100 and second component 200 are formed and are integrated by skill, or conversely, first component 100 and second component 200 are divided
Solution is into more subassemblies.It should be noted that the structure design and manufacturing process of all parts are really arbitrary, as long as being easy to shape
Composition from the particulate matter of different-grain diameter gas channel and be easy to that the electronic component for optical detection is installed in measuring chamber
.
Due to the moving parts such as fan need not be used in the particulate matter measuring apparatus of the present invention, therefore survey can be reduced
The volume of device is measured, reduces noise, improves reliability, and easily integrated with portable equipments such as mobile phones.Pass through air-flow
The design of passage can separate the particulate matter of different-grain diameter so that measuring chamber mainly collects small particle, therefore can improve
The resolution ratio and measurement accuracy of grain thing measurement apparatus.
Fig. 2 shows the schematic sectional view of particulate matter measuring apparatus according to the second embodiment of the present invention.It is real second
In the accompanying drawing for applying example and subsequent embodiment, for brevity, the electronic component for being used for optical detection in measuring chamber, example is not shown
Such as the light source 110 in measuring chamber, light shield 120 and photodetector 130.It is appreciated that the particulate matter measuring apparatus of the present invention
Actually include the above-mentioned electronic component for optical detection.
It is different from the particulate matter measuring apparatus of first embodiment, at least a portion side wall of measuring chamber 360 be it is inclined,
Angle i.e. between side wall and bottom is more than 90 degree.
At work, particulate matter measuring apparatus moves in ambient air.Bulky grain thing enters measuring chamber 360 by accident.
Due to quality and the difference of volume, the kinetic characteristic of the particulate matter of different-grain diameter is different.The direction of motion of small particle easily by
To the influence of airflow direction change.When reaching the 4th gas channel 352 change airflow direction from measuring chamber 360, small particle
The direction of motion also change therewith.However, the direction of motion of bulky grain thing is influenceed very little by airflow direction change, easily arrive
Reach and collide the side wall of measuring chamber 360.If side wall is vertical, bulky grain thing will launch return measurement room.In the implementation
In example, easily ejected due to side wall wide-angle tilt, therefore with the bulky grain thing of side wall collision via the 4th gas channel 352
Measuring chamber 360.The Curve guide impeller further improves measuring chamber 360 using the dynamics of particulate matter and separated except bulky grain
The ability of thing, so as to improve the resolution ratio of particulate matter measuring apparatus and measurement accuracy.
According to other aspects of the particulate matter measuring apparatus of second embodiment with being measured according to the particulate matter of first embodiment
Device is identical.
Fig. 3 shows the schematic sectional view of particulate matter measuring apparatus according to the third embodiment of the invention.It is real with first
It is different to apply the particulate matter measuring apparatus of example, the 3rd gas channel 351 and the 4th gas channel 352, at least one of measuring chamber 360
Point side wall is inclined, namely the angle between the side wall of above-mentioned part and bottom is more than 90 degree.
At work, particulate matter measuring apparatus moves in ambient air.Bulky grain thing enters measuring chamber 360 by accident.
Due to quality and the difference of volume, the kinetic characteristic of the particulate matter of different-grain diameter is different.The direction of motion of small particle easily by
To the influence of airflow direction change.When reaching the 4th gas channel 352 change airflow direction from measuring chamber 360, small particle
The direction of motion also change therewith.However, the direction of motion of bulky grain thing is influenceed very little by airflow direction change, easily arrive
Reach and collide the side wall of measuring chamber 360.If side wall is vertical, bulky grain thing will launch return measurement room.In the implementation
In example, because the 3rd gas channel 351 and the 4th gas channel 352, at least a portion side wall wide-angle of measuring chamber 360 incline
Tiltedly, therefore with the bulky grain thing of side wall collision easily measuring chamber 360 is ejected via the 4th gas channel 352.The Curve guide impeller
Further improve measuring chamber 360 using the dynamics of particulate matter to separate except the ability of bulky grain thing, so as to improve
The resolution ratio and measurement accuracy of grain thing measurement apparatus.
According to other aspects of the particulate matter measuring apparatus of 3rd embodiment with being measured according to the particulate matter of first embodiment
Device is identical.
Fig. 4 shows the schematic sectional view of particulate matter measuring apparatus according to the fourth embodiment of the invention.It is real with first
It is different to apply the particulate matter measuring apparatus of example, the first storeroom 321, the second storeroom 322 are not only formed in second component 200,
It yet forms both the 3rd storeroom 323 and the 4th storeroom 324.First gas channel 311 connects with the first storeroom 321, and second
Gas channel 312 connects with the second storeroom 322.The middle part of 3rd gas channel 351 connects with the 3rd storeroom 323, end
Connected with measuring chamber 360.The middle part of 4th gas channel 352 connects with the 4th storeroom 324, and end connects with measuring chamber 360
It is logical.In addition, the 3rd gas channel 351 and the 4th gas channel 352, at least a portion side wall of measuring chamber 360 are inclined,
Angle between the side wall of i.e. above-mentioned part and bottom is more than 90 degree.
At work, particulate matter measuring apparatus moves in ambient air.Because gas-flow resistance is different, the first storeroom
321 and second storeroom 322 collect and discharge respectively the particulate matter of the first average grain diameter, the 3rd storeroom 323 and the 4th storage
The particulate matter of the second average grain diameter is collected and discharged respectively in room 324, and measuring chamber 360 collects the particulate matter of the 3rd average grain diameter, its
In the 3rd average grain diameter be less than the second average grain diameter and the second average grain diameter and be less than the first average grain diameter.In ambient air
Small particle is easier to suck in measuring chamber 360 than bulky grain, so as to which the small particle in air is separated with bulky grain.
As a result, small particle is mainly captured in measuring chamber 360.
Bulky grain thing enters measuring chamber 360 by accident.Due to quality and the difference of volume, the fortune of the particulate matter of different-grain diameter
Dynamic characteristic is different.The direction of motion of small particle is easily influenceed by airflow direction change.The 4th is reached from measuring chamber 360
When gas channel 352 changes airflow direction, the direction of motion of small particle also changes therewith.However, the motion side of bulky grain thing
Very little is influenceed to being changed by airflow direction, is accessible to and collides the side wall of measuring chamber 360.If side wall is vertical,
Then bulky grain thing will launch return measurement room.In this embodiment, due to the 3rd gas channel 351 and the 4th gas channel 352,
At least a portion side wall wide-angle tilt of measuring chamber 360, therefore the bulky grain thing collided with side wall is easily via the 4th air-flow
Passage 352 ejects measuring chamber 360.The Curve guide impeller further improves measuring chamber 360 using the dynamics of particulate matter
The ability except bulky grain thing is separated, so as to improve the resolution ratio of particulate matter measuring apparatus and measurement accuracy.
It is similar with the removing method of the bulky grain thing in measuring chamber 360, in the 3rd storeroom 323 and the 4th storeroom 324
The bulky grain thing of collection removes also by the collision when particulate matter is measured and moved between inclined side wall.
According to other aspects of the particulate matter measuring apparatus of fourth embodiment with being measured according to the particulate matter of first embodiment
Device is identical.
Fig. 5 shows the schematic sectional view of particulate matter measuring apparatus according to the fifth embodiment of the invention.It is real with first
It is different to apply the particulate matter measuring apparatus of example, the interface channel that the first storeroom 321 and the second storeroom 322 reduce via sectional area
325 connections.By selecting the sectional area of interface channel 325, the first gas channel 311 and the second gas channel 312 can be adjusted
Gas-flow resistance, so as to which the efficiency that the first storeroom 321 and the second storeroom 322 collect bulky grain thing will be adjusted.
More bulky grain thing can be trapped in the first storeroom 321 and the second storeroom 322 by the Curve guide impeller
In, therefore the quantity into the bulky grain thing in measuring chamber 360 can be reduced, so as to improve the resolution ratio of particulate matter measuring apparatus
And measurement accuracy.
According to other aspects of the particulate matter measuring apparatus of the 5th embodiment with being measured according to the particulate matter of first embodiment
Device is identical.
Fig. 6 shows the schematic sectional view of particulate matter measuring apparatus according to the sixth embodiment of the invention.The particulate matter
Measurement apparatus is including the second component 210 positioned at first component 100 and above first component 100 and positioned at first component
The third member 220 of 100 lower sections.First component 100, second component 210 and third member 220 are by that can limit spatial form
Any material forms, such as plastics, glass, semiconductor, aluminium alloy, stainless steel etc..
Measuring chamber 360 is formed in first component 100, the storage of the first storeroom 321, second is formed in second component 210
Room 322 is deposited, the 3rd storeroom 323, the 4th storeroom 324 are formed in third member 220.
First component 100 and second component 210 limit the first gas channel 311, the second gas channel the 312, the 3rd together
Gas channel 351, the 4th gas channel 352.First gas channel 311 connects with the first storeroom 321, the second gas channel
312 connect with the second storeroom 322.In addition, the first gas channel 311 connects via the 3rd gas channel 351 with measuring chamber 360
Logical, the second gas channel 312 connects via the 4th gas channel 352 with measuring chamber 360.3rd gas channel 351 is relative to
One gas channel 311 and the 4th gas channel 352 change gas flow direction relative to the second gas channel 312 so that
Gas-flow resistance increase.
First component 100 and third member 220 limit the 5th gas channel 313, the 6th gas channel the 314, the 7th together
Gas channel 353, the 8th gas channel 354.5th gas channel 313 connects with the 3rd storeroom 323, the 6th gas channel
314 connect with the 4th storeroom 324.In addition, the 5th gas channel 313 connects via the 7th gas channel 353 with measuring chamber 360
Logical, the 6th gas channel 314 connects via the 8th gas channel 354 with measuring chamber 360.7th gas channel 353 is relative to
Five gas channels 313 and the 8th gas channel 354 change gas flow direction relative to the 6th gas channel 314 so that
Gas-flow resistance increase.
3rd gas channel 351, the 4th gas channel 352, the 7th gas channel 353 and the 8th gas channel 354, measurement
At least a portion side wall of room 360 is inclined, namely the angle between the side wall of above-mentioned part and bottom is more than 90 degree.
At work, particulate matter measuring apparatus moves in ambient air, due to particulate matter measuring apparatus and ambient air
Relative motion and produce air-flow.For example, in figure 6, the direction of motion of particulate matter measuring apparatus is as shown in big arrow, air-flow side
To then as illustrated by small arrows.If the direction of motion on the contrary, if airflow direction invert.
According to other aspects of the particulate matter measuring apparatus of sixth embodiment with being measured according to the particulate matter of first embodiment
Device is identical.
In the example depicted in fig. 6, the Part I of air-flow enters first from exterior space via the first gas channel 311
Storeroom 321, Part II enter exterior space from the second storeroom 322 via the second gas channel 312, and Part III is from one
The exterior space of side reaches measuring chamber 360, and Part IV via the first gas channel 311, the 3rd gas channel 351 successively
The exterior space of opposite side is reached via the 4th gas channel 352 and the second gas channel 312 from measuring chamber 360.The opposing party
Face, the Part V of air-flow enter the 3rd storeroom 323 from exterior space via the 5th gas channel 313, and Part VI is from the
Four storerooms 324 enter exterior space via the 6th gas channel 314, and Part VII passes through successively from the exterior space of side
Measuring chamber 360 is reached by the 5th gas channel 313, the 7th gas channel 353, and Part VIII from measuring chamber 360 via
Eight gas channels 354 and the 6th gas channel 314 reach the exterior space of opposite side.
Because gas-flow resistance is different, the first storeroom 321, the second storeroom 322, the 3rd storeroom 323 and the 4th storage
The particulate matter of the first average grain diameter is collected and discharged respectively in room 324, and measuring chamber 360 collects the particulate matter of the second average grain diameter, its
In the second average grain diameter be less than the first average grain diameter.Small particle in ambient air is easier to suck measuring chamber than bulky grain
In 360, so as to which the small particle in air is separated with bulky grain.As a result, little particle is mainly captured in measuring chamber 360
Thing.
Bulky grain thing enters measuring chamber 360 by accident.Due to quality and the difference of volume, the fortune of the particulate matter of different-grain diameter
Dynamic characteristic is different.The direction of motion of small particle is easily influenceed by airflow direction change.The 4th is reached from measuring chamber 360
When the gas channel 354 of gas channel 352 or the 8th changes airflow direction, the direction of motion of small particle also changes therewith.So
And the direction of motion of bulky grain thing is influenceed very little by airflow direction change, it is accessible to and collides the side of measuring chamber 360
Wall.If side wall is vertical, bulky grain thing will launch return measurement room.In this embodiment, due to the 3rd gas channel
351 and at least one of the 4th gas channel 352, the 7th gas channel 353 and the 8th gas channel 354 and measuring chamber 360
Divide side wall wide-angle tilt, therefore easily lead to the bulky grain thing of side wall collision via the 7th gas channel 353 and the 8th air-flow
Road 354 ejects measuring chamber 360.The Curve guide impeller further improves measuring chamber 360 using the dynamics of particulate matter and divided
Leave away except the ability of bulky grain thing, so as to improve the resolution ratio of particulate matter measuring apparatus and measurement accuracy.
According to other aspects of the particulate matter measuring apparatus of sixth embodiment with being measured according to the particulate matter of first embodiment
Device is identical.
Fig. 7 shows the schematic sectional view of particulate matter measuring apparatus according to the seventh embodiment of the invention.It is real with the 6th
It is different to apply the particulate matter measuring apparatus of example, in addition to the first to the 8th gas channel, yet forms both in second component 210 with
The 9th gas channel 315 and connect with the 4th gas channel 352 that 3rd gas channel 351 connects and bearing of trend is consistent
The tenth consistent gas channel 316 of logical and bearing of trend, yet forms both and the 7th gas channel 353 in third member 220
Connect and the 11st gas channel 317 that bearing of trend is consistent and connected with the 8th gas channel 354 and the side of extension
To the 12nd consistent gas channel 318.
At work, bulky grain thing enters measuring chamber 360 by accident.Due to quality and the difference of volume, different-grain diameter
The kinetic characteristic of particulate matter is different.The direction of motion of small particle is easily influenceed by airflow direction change.From measuring chamber
360 reach the 4th gas channels 352 or the 8th gas channel 354 when changing airflow direction, the direction of motion of small particle also with
Change.However, the direction of motion of bulky grain thing is influenceed very little by airflow direction change, it is accessible to and collides measuring chamber
360 side wall.If side wall is vertical, bulky grain thing will launch return measurement room.In this embodiment, due to the 3rd gas
The gas channel 352 of circulation road 351 and the 4th, the 7th gas channel 353 and the 8th gas channel 354 and measuring chamber 360 are extremely
Few a part of side wall wide-angle tilt, therefore the bulky grain thing collided with side wall is easily via the tenth gas channel 316 and the tenth
Two gas channels 318 eject measuring chamber 360.Tenth gas channel 316 is connected with the 4th gas channel 352 and the side of extension
To consistent, the 12nd gas channel 318 is connected with the 8th gas channel 354 and bearing of trend is consistent, big so as to avoid
The probability of particulate matter ejection return measurement room.The Curve guide impeller further improves measuring chamber using the dynamics of particulate matter
360 separate except the ability of bulky grain thing, so as to improve the resolution ratio of particulate matter measuring apparatus and measurement accuracy.
According to other aspects of the particulate matter measuring apparatus of the 7th embodiment with being measured according to the particulate matter of sixth embodiment
Device is identical.
Above-described embodiment is the citing of the present invention, although disclosing embodiments of the invention and accompanying drawing for the purpose of illustration,
But it will be appreciated by those skilled in the art that：Without departing from the spirit and scope of the invention and the appended claims, respectively
It is all possible that kind, which is replaced, changed and modifications,.Therefore, the present invention should not be limited to embodiment and accompanying drawing disclosure of that.
Claims (12)
1. a kind of particulate matter measuring apparatus, the particulate matter measuring apparatus moves in ambient air and produces air-flow, including：
First storeroom and the second storeroom relative to each other, for collecting and discharging the particulate matter of the first average grain diameter；
Measuring chamber, for collecting the particulate matter of the second average grain diameter, wherein the second average grain diameter is less than the first average grain diameter；
Light source and photodetector in the measuring chamber, the light source and the photodetector are each other in angle to examine
Survey scatters light as caused by the particulate matter of the second average grain diameter；
First gas channel, exterior space is connected with the first storeroom；
Second gas channel, exterior space is connected with the second storeroom；
3rd gas channel, the end of the first gas channel is connected with measuring chamber, and the 3rd gas channel and the first air-flow
The bearing of trend of passage is different；
4th gas channel, the end of the second gas channel is connected with measuring chamber, and the 4th gas channel and the second air-flow
The bearing of trend of passage is different.
2. particulate matter measuring apparatus according to claim 1, in addition to first component and above first component
Two parts, wherein forming measuring chamber in first component, the first storeroom and the second storeroom are formed in second component, and
First component and second component limit the first gas channel, the second gas channel, the 3rd gas channel and the 4th air-flow and led to together
Road.
3. particulate matter measuring apparatus according to claim 2, wherein first component and second component are by selected from plastics, glass
A kind of material composition in glass, semiconductor, aluminium alloy, stainless steel.
4. at least a portion side wall of particulate matter measuring apparatus according to claim 1, wherein measuring chamber is relative to measurement
The angle of the bottom of room is more than 90 degree.
5. particulate matter measuring apparatus according to claim 4, wherein the 3rd gas channel and the 4th gas channel are respective
At least a portion side wall is more than 90 degree relative to the angle of the bottom of measuring chamber.
6. particulate matter measuring apparatus according to claim 5, in addition to：
5th gas channel, the end of the first gas channel is connected with exterior space, and the 5th gas channel and the 3rd gas
The bearing of trend of circulation road is identical；And
6th gas channel, the end of the second gas channel is connected with exterior space, and the 6th gas channel and the 4th gas
The bearing of trend of circulation road is identical.
7. particulate matter measuring apparatus according to claim 5, in addition to：
3rd storeroom and the 4th storeroom, for collecting and discharging the particulate matter of the 3rd average grain diameter,
Wherein, the 3rd storeroom connects with the middle part of the 3rd gas channel, and the 4th storeroom in the middle part of the 4th gas channel with connecting
It is logical, also, the 3rd average grain diameter is less than the first average grain diameter and is more than the second average grain diameter.
8. according to the particulate matter measuring apparatus of any one of claim 1 to 7, in addition to the 3rd below first component
Part, and the multiple gas channels corresponding with first component and multiple storerooms are formed using third member.
9. particulate matter measuring apparatus according to claim 1, in addition to interface channel, the first storeroom and second are stored
Room connects, and the sectional area of interface channel is less than the sectional area of the first gas channel and the second gas channel.
10. particulate matter measuring apparatus according to claim 1, in addition to the light shield relative with light source, for absorbing light
The direct light in source.
11. particulate matter measuring apparatus according to claim 1, wherein the light source is LED array light source.
12. particulate matter measuring apparatus according to claim 1, wherein the photodetector is photodiode.
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| US10094776B2 (en) * | 2016-07-18 | 2018-10-09 | Honeywell International Inc. | Dust sensor with mass separation fluid channels and fan control |
| FR3066598B1 (en) * | 2017-05-17 | 2019-07-26 | Eco Logic Sense Sas | SENSOR FOR MEASURING CONCENTRATION OF PARTICLES IN THE AIR |
| CN107314959A (en) * | 2017-06-09 | 2017-11-03 | 朱慧珑 | Particulate separation and measurement apparatus |
| CN107421858A (en) * | 2017-06-15 | 2017-12-01 | 中国科学技术大学 | Portable type electronic product and its microparticle thing sensing device |
| CN109444010A (en) * | 2018-12-13 | 2019-03-08 | 美时美克(上海)汽车电子有限公司 | A kind of air passage structure of laser class detection of air quality module |
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