CN108613906A - Particulate matter detection means - Google Patents
Particulate matter detection means Download PDFInfo
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- CN108613906A CN108613906A CN201810725062.7A CN201810725062A CN108613906A CN 108613906 A CN108613906 A CN 108613906A CN 201810725062 A CN201810725062 A CN 201810725062A CN 108613906 A CN108613906 A CN 108613906A
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- 238000001514 detection method Methods 0.000 title claims abstract description 105
- 239000013618 particulate matter Substances 0.000 title claims abstract description 52
- 238000005192 partition Methods 0.000 claims abstract description 36
- 238000009423 ventilation Methods 0.000 claims abstract description 24
- 239000002245 particle Substances 0.000 claims abstract description 21
- 239000007769 metal material Substances 0.000 claims description 3
- 208000002925 dental caries Diseases 0.000 abstract description 6
- 238000009434 installation Methods 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 description 19
- 238000000149 argon plasma sintering Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000004887 air purification Methods 0.000 description 2
- 239000012491 analyte Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The present invention relates to a kind of particulate matter detection means, including：Shell is provided with air inlet and air outlet；The inner space of shell is separated into upper layer cavity and lower layer's cavity by partition board, and upper layer cavity is connected to air inlet, and lower layer's cavity is connected to air outlet, and the ventilation opening of connection upper layer cavity and lower layer's cavity is provided on partition board；Circuit board is arranged in upper chamber body；Light source, installation is on circuit boards；Photoelectric sensor, installation scatter light caused by light irradiation air on circuit boards, for receiving；Processor is mounted on the circuit board, and the signal for being exported according to photoelectric sensor calculates particle concentration；Fan is arranged in lower layer's cavity.By the way that particulate matter detection means are arranged to two cavitys up and down, fan and detection part can be kept apart, reduce interference of the fan to detection part, and hierarchical design can reduce the appearance and size of device up and down, keep the length, width and height of detection device more balanced, is easily installed.
Description
Technical field
The present invention relates to Detection of Air Quality fields, and in particular, to a kind of to detect particle in air using light scattering method
The particulate matter detection means of object concentration.
Background technology
In many fields of production and living, need to be detected particle concentration.The detection method of particulate matter mainly has
Screening, microscope, sedimentation, electric induction, light scattering method etc., wherein light scattering method testing time section can be measured continuously, be avoided
The drawbacks of factors such as climate variation, humidity variation influence detection result, thus it is applied widely, it quickly grows, is current
Relatively good particle detection method.
In the existing detection device for carrying out particle analyte detection using light scattering method, air stream drives part (including fan
Deng) interference can be generated to detection part (including light source and photoelectric sensor etc.), influence accuracy of detection, and existing detection device
Entire length is bigger, is not easy to the practical application of product.
Invention content
The object of the present invention is to provide a kind of accuracy of detection higher, the stronger particulate matter detection means of practicability.
To achieve the goals above, the present invention provides a kind of particulate matter detection means, including：
Shell is provided with air inlet and air outlet；
The inner space of the shell is separated into upper layer cavity and lower layer's cavity, the upper layer cavity and institute by partition board
State air inlet connection, lower layer's cavity be connected to the air outlet, be provided on the partition board be connected to the upper layer cavity with
The ventilation opening of lower layer's cavity；
Circuit board is arranged in the upper chamber body；
Light source is mounted on the circuit board；
Photoelectric sensor is mounted on the circuit board, for receiving the light irradiation air institute sent out by the light source
The scattering light of generation；
Processor is mounted on the circuit board, is corresponded to for receiving the scattering light according to the photoelectric sensor
The signal of output calculates the particle concentration in air；
Fan is arranged in lower layer's cavity, for generating negative pressure so that air is entered by the air inlet outside described
In shell.
Optionally, multiple baffles are staggeredly equipped in the gas channels, the air into the gas channels passes through institute
The photoelectric sensor is flowed through after stating multiple baffles.
Optionally, the circuit board is arranged with partition board parallel interval, is formed with and the divider upright on the partition board
Gas channels side wall, the gas channels side wall are abutted with circuit board, and the gas channels side wall is in the partition board and circuit board
Between be separated out the gas channels.
Optionally, the particulate matter detection means further include fan shroud, and the fan shroud is arranged under described
In layer cavity and between the fan and partition board.
Optionally, the shell includes housing main body, upper cover body and lower cover, the partition board and housing main body one at
Type, the upper cover body close the upper end opening of the housing main body, and the lower cover closes the lower ending opening of the housing main body.
Optionally, the upper cover body and lower cover are metal material.
Optionally, it is provided at least two air inlets on the shell, includes at least two gas in the upper chamber body
Paths, the particulate matter detection means include at least two light sources and at least two photoelectric sensors, the gas channels with
The air inlet corresponds, and each gas channels are connected to corresponding air inlet；The light source and the gas channels are one by one
Corresponding, each light source is used to the light sent out injecting corresponding gas channels；The photoelectric sensor and the gas channels
It corresponds, each photoelectric sensor is arranged in corresponding gas channels；The photoelectric sensor is a pair of with the light source one
It answers, each photoelectric sensor is used to detect caused by the light irradiation air sent out by corresponding light source and scatters light.
Optionally, the quantity of the ventilation opening is less than or equal to the quantity of the gas channels.
Optionally, at least two gas channels share a ventilation opening.
Optionally, at least two gas channels are not connected to mutually in the upper chamber body, and each gas channels have
Respective ventilation opening.
The particulate matter detection means of the present invention are functionally divided into two cavitys up and down, and lower layer's cavity is air stream drives portion
Point, enter detection device for certain driving air-flow, upper layer cavity is detection part, for detecting into air-flow in detection device
Grain object concentration.By the way that particulate matter detection means are arranged to two cavitys up and down, on the one hand can by fan and detection part every
It leaves, to reduce interference of the fan to detection part, improves accuracy of detection；On the other hand, upper and lower hierarchical design can reduce inspection
The appearance and size for surveying device, keeps the length, width and height of detection device more balanced, in order to install.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Attached drawing is to be used to provide further understanding of the present invention, an and part for constitution instruction, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is a kind of stereoscopic schematic diagram of the particulate matter detection means of embodiment according to the present invention；
Fig. 2 is the exploded view of shell in a kind of particulate matter detection means of embodiment according to the present invention；
Fig. 3 is that a kind of vertical view of the particulate matter detection means of embodiment according to the present invention after removing upper cover body is shown
It is intended to；
Fig. 4 is that a kind of particulate matter detection means the looking up after removing lower cover of embodiment according to the present invention is shown
It is intended to；
Fig. 5 is that the air flowing in a kind of upper chamber body of the particulate matter detection means of embodiment according to the present invention is shown
It is intended to；
Fig. 6 is vertical view of the particulate matter detection means of another embodiment according to the present invention after removing upper cover body
Schematic diagram；
Fig. 7 is the particulate matter detection means of another embodiment according to the present invention looking up after removing lower cover
Schematic diagram；
Fig. 8 is the air flowing in the upper chamber body of the particulate matter detection means of another embodiment according to the present invention
Schematic diagram.
Reference sign
10 shell, 101 housing main body
102 upper cover body, 103 lower cover
104 air inlet, 105 air outlet
20 partition board, 201 ventilation opening
30 light source, 40 photoelectric sensor
50 first temperature sensor, 60 heating element
70 second temperature sensor, 80 gas channels side wall
90 baffle, 100 upper layer cavity
110 lower layer's cavity, 120 fan
130 fan shrouds
Specific implementation mode
The specific implementation mode of the present invention is described in detail below in conjunction with attached drawing.It should be understood that this place is retouched
The specific implementation mode stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The nouns of locality such as "upper", "lower" are employed herein, it should be noted that the use of these nouns of locality is only
Relative position relation between signified part or element for ease of description does not indicate or imply the indicated part or member
Part must have a particular orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
As shown in Figures 1 to 8, the present invention provides a kind of particulate matter detection means, which includes shell
10, partition board 20, light source 30, photoelectric sensor 40, circuit board (not shown), processor (not shown) and fan 120.
As shown in Figures 1 to 4, air inlet 104 and air outlet 105 are provided on shell 10.Partition board 20 is arranged in shell 10
Interior, the inner space of shell 10 is separated into upper layer cavity 100 and lower layer's cavity 110 by partition board 20, wherein upper layer cavity 100 with
Air inlet 104 is connected to, and lower layer's cavity 110 is connected to air outlet 105.Connection upper layer cavity 100 and lower layer are provided on partition board 20
The ventilation opening 201 of cavity 110.
Circuit board is arranged in upper layer cavity 100, and fan 120 is arranged in lower layer's cavity 110.Light source 30, photoelectric sensing
Device 40 and processor installation are on circuit boards.
Photoelectric sensor 40 for example can be photodiode, and photodiode, which is one kind, can convert optical signals into electricity
The optical detector of signal or voltage signal is flowed, the tube core of photodiode is using a PN junction with light sensitive characteristic, to light
Variation it is very sensitive.
Light source 30 can be laser generator, can also be infrared generator.Concavees lens can be integrated on light source 30,
Preferably, the light focusing that concavees lens send out light source 30 is in the surface of photoelectric sensor 40, so that photoelectric sensor 40
Photosensitive effect reaches best.
When detection device works, fan 120 rotates, and makes to form negative pressure in lower layer's cavity 110, due to 100 He of upper layer cavity
Lower layer's cavity 110 is connected by the ventilation opening 201 on partition board 20, therefore negative pressure is also formed in upper layer cavity 100, air stream by
Air inlet 104 enters upper layer cavity 100, and when containing particulate matter in air stream, the light that light source 30 is sent out is radiated at particulate matter
Upper generation scattering, this scattering light are received by photoelectric sensor 40, and 40 optical signals received of photoelectric sensor are converted into telecommunications
Number, and the electric signal is sent to processor, there is corresponding algorithm in processor, can calculate in this Airflow
Particle concentration.
The particulate matter detection means of the present invention are functionally divided into two cavitys up and down, and lower layer's cavity 110 is air stream drives
Region, fan 120 is loaded in lower layer's cavity 110 enters detection device for certain driving air-flow, and upper layer cavity 100 is detection zone,
Circuit board, light source 30, photoelectric sensor 40, heating element 60, the first temperature sensor 50, second temperature sensor 70 and processing
Device is loaded on the interior particle concentration for detecting into air-flow in detection device of upper layer cavity 100.In practical application, upper and lower layer
The device installed in cavity 100,110 is required without specific limit.
It, on the one hand can be by fan 120 and detection part by the way that particulate matter detection means are arranged to two cavitys up and down
Keep apart, to reduce interference of the fan 120 to detection part, improves accuracy of detection；On the other hand, upper and lower hierarchical design can subtract
The appearance and size of small detection device keeps the length, width and height of detection device more balanced, in order to install, if by fan 120 and inspection
It surveys part and is placed on same layer, length and/or the width that will result in detection device are bigger, are not easy to the practical application of product.
Here, detection device can be in integrally any suitable shapes such as cube, cylinder, Elliptic Cylinder.
It should be noted that the term " upper layer cavity ", " lower layer's cavity " used in the present invention are only to be based on Fig. 1 and figure
For 2 page, the relative position relation of only two cavitys represented, do not represent in real use state or
Upper layer cavity 100 must be positioned at the top of lower layer's cavity 110 when installation condition.In other words, in real use state or installation
State, upper layer cavity 100 and lower layer's cavity 110 can have any suitable position relationship, for example, upper layer cavity 100 can be with
Positioned at the top of lower layer's cavity 110, the lower section of lower layer's cavity 110 can also be located at；Upper layer cavity 100 can be located at lower layer's cavity
110 left side can also be located at the right side of lower layer's cavity 110.
In one embodiment, as shown in figs. 4 and 7, particulate matter detection means further include fan shroud 130, wind
The fan setting of shielding case 130 is in lower layer's cavity 110 and is located at 120 periphery of fan, and fan shroud 130 is located at 120 He of fan
Between partition board 20.By the way that partition board 20 and fan shroud 130 is arranged, fan 120 can be reduced to the maximum extent to upper layer cavity
The interference of detection part in 100 improves accuracy of detection.
In one embodiment, as shown in Fig. 2, shell 10 is by 103 structure of housing main body 101, upper cover body 102 and lower cover
Can be in the tubular structure of upper and lower both ends open at, housing main body 101, partition board 20 be located at housing main body 101 it is interior and with shell master
Body 101 is integrally formed, and upper cover body 102 and lower cover 103 are connected with housing main body 101,102 closure main body of upper cover body
101 upper end opening, the lower ending opening of 103 closure main body 101 of lower cover are formed between upper cover body 102 and partition board 20
Layer cavity 100, forms lower layer's cavity 110 between lower cover 103 and partition board 20.In one embodiment, upper cover body 102 is under
Lid 103 is metal material, can shield external interference, further increases accuracy of detection.Housing main body 101 and partition board 20
It can be by being integrally formed.Here, by making 103 split settings of housing main body 101, upper cover body 102 and lower cover, and
So that housing main body 101 and partition board 20 is integrally formed, assembling can be simplified, simultaneously in order to the manufacturing of particulate matter detection means
Reduce production cost.
In one embodiment, as shown in Figure 3 and Figure 6, in upper layer cavity 100 include gas channels, gas channels
It is connected to air inlet 104, multiple baffles 90 is staggeredly equipped in gas channels, on air-flow direction, photoelectric sensor 40
It is arranged in the downstream of multiple baffle 90, the outside air into gas channels flows through photoelectric sensing by multiple baffle is after 90s
Device 40.Due to the presence of baffle 90 so that air stream flowing not smooth in gas channels needs around corresponding
Baffle 90, therefore baffle 90 can effectively stop that the sundries such as batting enter influence accuracy of detection at photoelectric sensor 40.
In some cases .., user wishes to know simultaneously the environment without air purification and the environment Jing Guo air purification
The comparative situation of particle concentration.Such as, while particle concentration in indoor and outdoor air is known, in order to understand fresh air system
Purge cases.Again such as, while particle concentration in vehicle inner air and outer air is known, with comparing difference.
In order to keep the particulate matter that the particulate matter detection means of the present invention are detected simultaneously under two kinds of varying environment occasions dense
Degree, to meet the demand of user, in one embodiment, as shown in Figure 3 and Figure 6, on shell 10 setting there are two into
Air port 104, upper layer cavity 100 is interior comprising there are two gas channels, and particulate matter detection means include two light sources 30 and two light
Electric transducer 40.Wherein, gas channels are corresponded with air inlet 104, and each gas channels connect with corresponding air inlet 104
It is logical；Light source 30 is corresponded with gas channels, and each light source 30 is used to the light sent out injecting corresponding gas channels；Photoelectricity
Sensor 40 is corresponded with gas channels, and each photoelectric sensor 40 is arranged in corresponding gas channels；Photoelectric sensor
40 correspond with light source 30, and each photoelectric sensor 40 is used to detect the light irradiation air institute sent out by corresponding light source 30
The scattering light of generation.Particulate matter detection means work when, fan 120 rotation generate negative pressure, under the action of negative pressure air stream by
Two air inlets 104 enter corresponding two gas channels, and each gas channels have respective light source 30 and photoelectric sensor
40, to realize that a detection device can detect the function of two-way air-flow particulate matter simultaneously.
Certainly, in practical applications, can also be arranged in particulate matter detection means three or three or more gas channels with
Realize that a particulate matter detection means are carried out at the same time the particle analyte detection under a variety of environment occasions and work, in each gas channels
With corresponding light source 30 and photoelectric sensor 40.In this way, it is possible to detect the particle in multiple and different environment spaces simultaneously
Object concentration realizes that a device detects multiple spaces, or in the case where requiring high to accuracy of detection, multiple gas channels
A kind of environment space can be only detected simultaneously, and particle concentration is determined after the testing result of the multiple gas channels of comprehensive analysis.
In some embodiments, it due to having at least two gas channels inside particulate matter detection means, is examining
When surveying the particle concentration under a kind of environment occasion, can jointly it be detected with these gas channels, processor is according to these gas circuits
The signal that photoelectric sensor 40 in channel is sent carries out comprehensive calculation and analysis, obtains the particle concentration under the environment occasion,
It is possible thereby to improve accuracy of detection.
Optionally, in the particle concentration under detecting a kind of environment occasion, the alternately inspection of these gas channels can also be used
It surveys, it is long to avoid 30 stream time of same light source.After the light source 30 of a gas channels goes wrong, it can enable
The light source 30 of next gas channels, to achieve the purpose that extend the service life of entire detection device.When on a gas channels
The numerical value of optical sensor detection when occurring abnormal, other gas channels can be opened and verified, so that it is determined that the number of detection
Whether it is due to caused by 40 failure of photoelectric sensor that value is abnormal.
Here, these gas channels provide air stream drives power by the same fan 120, can not only reduce the number of fan 120
Amount saves cost, and can ensure the wind speed consistency of these gas channels, improves accuracy of detection.
In order to keep detection device internal structure more compact, in one embodiment, as shown in Figure 3 and Figure 6, gas channels
Quantity be two, two gas channels in upper layer cavity 100 be symmetrical arranged.
The present invention is not limited the quantity of ventilation opening 201, ventilation opening 201 can with one, two it is even more.It is logical
The quantity in air port 201 can be less than or equal to the quantity of gas channels, and ventilation opening 201 can be corresponded with gas channels and be set
It sets, can also be one ventilation opening of multiple gas channels correspondences, for example, two gas channels one ventilation openings 201 of correspondence, four
Gas channels correspond to two ventilation openings 201.
In one embodiment, as shown in figure 3, the quantity of ventilation opening 201 is one, two gas channels share one
Ventilation opening 201.In this case, in order to further ensure the wind speed consistency of two gas channels, ventilation opening 201 can position
Between two gas channels, two gas channels are symmetrical arranged about ventilation opening 201.
Gas exchanges occur for two gas channels in order to prevent, influence accuracy of detection, in another embodiment, such as scheme
Shown in 6, two gas channels are not connected to mutually in upper layer cavity 100, are separated two gas channels with plate body, are divulged information at this time
Mouth 201 is two, and there is each gas channels respective ventilation opening 201, i.e. ventilation opening 201 to be set with gas channels one-to-one correspondence
It sets.
In practical application, gas channels can be formed in upper layer cavity 100 by any suitable mode.Such as one
In kind embodiment, circuit board is arranged with 20 parallel interval of partition board, as shown in Figure 3 and Figure 6, is formed on partition board 20 and partition board 20
Vertical gas channels side wall 80, gas channels side wall 80 are abutted with circuit board, by gas channels side wall 80 in 20 He of partition board
Gas channels are separated out between circuit board.In this case, as shown in Figure 3 and Figure 6, gas channels side wall 80 can be formed in
Reinforcing rib on partition board 20, baffle 90 can be formed on gas channels side wall 80, that is to say, that gas channels side wall 80, gear
Plate 90, partition board 20 and housing main body 101 can be integrally formed, consequently facilitating the manufacturing of particulate matter detection means.
For detecting the detection device of particle concentration using light scattering method, the air mass flow in detection device is to inspection
Surveying result has significant impact, if not considering actual air flow, and it is dense that particulate matter is only calculated using preset value as parameter
Degree, will result in testing result, there are relatively large deviations with actual value, influence accuracy of detection.
For this purpose, in one embodiment, as shown in Fig. 3, Fig. 5, Fig. 6 and Fig. 8, being additionally provided with and adding in each gas channels
Thermal element 60, the first temperature sensor 50 and second temperature sensor 70, heating element 60, the first temperature sensor 50 and second
Temperature sensor 70 is respectively mounted on circuit boards, also, along air-flow direction, and the first temperature sensor 50 is located at heating element
60 upstream, second temperature sensor 70 are located at the downstream of heating element 60, that is to say, that the front and back of heating element 60 respectively has one
A temperature sensor.First temperature sensor 50, second temperature sensor 70 correspond to the temperature for flowing through air for detecting, and first
Temperature sensor 50 and second temperature sensor 70 are corresponded to according to the temperature of detection to be generated and detection relevant first temperature of temperature
Signal and second temperature signal, and first temperature signal and second temperature signal are sent to processor.
When particulate matter detection means work, heating element 60 can heat the air in gas channels, about 60 heating element
The air themperature of trip has difference, in general, the temperature that the first temperature sensor 50 detects is relatively low, second temperature sensor 70 is examined
The temperature measured is higher.It is upper and lower that the temperature that processor is detected according to two temperature sensors can calculate heating element 60
Swim the temperature difference of air.
When the air velocity in gas channels is zero, atmospheric heat center is located at right over heating element 60, from air
Heat center is closer, and air themperature is higher, remoter from atmospheric heat center, and air themperature is lower.If the first temperature sensor
50 is equal to the distance of heating element 60 with second temperature sensor 70, then when air velocity is zero, two temperature sensors
The air themperature detected is equal.
When the air velocity in gas channels is not zero, atmospheric heat center elapses forward, second temperature sensor 70
Distance to atmospheric heat center reduces, and the distance of the first temperature sensor 50 to atmospheric heat center increases.In certain air
In flow rates, air velocity is faster, and the distance that atmospheric heat center elapses forward is bigger, and second temperature sensor 70 arrives air
The distance at heat center is smaller, and the distance of the first temperature sensor 50 to atmospheric heat center is bigger.That is, certain empty
Within the scope of gas velocity, air velocity is faster, then the temperature difference for the air themperature that two temperature sensors detect is bigger；Air stream
Speed is slower, then the temperature difference for the air themperature that two temperature sensors detect is smaller.
Therefore, it can be stored with the mapping table of temperature difference and air velocity in processor, closed by inquiring the correspondence
Air velocity in current gas channels can be obtained by being table, and then obtain the air flow value in current gas channels.Processing
Device according in current gas channels air flow value and photoelectric sensor 40 receive the signal meter of corresponding output after scattering light
Calculate particle concentration.
By the combination of heating element 60 and temperature sensor, the actual air stream in gas channels can be effectively calculated
Amount, particle concentration is calculated using actual air flow as parameter can make testing result more accurate, to improve accuracy of detection.
Compared to general air flow meter, using the occupied space smaller of combination of heating element 60 and temperature sensor, cost
It is lower, it is convenient for actual production and application.Moreover, in the combination, heating element can be in low in particulate matter detection means
The detection device is internally heated when under warm environment, to ensure that particulate matter detection means at low ambient temperatures can also be just
Often work.
In one embodiment, photoelectric sensor is arranged in gas channels, and along air-flow direction, photoelectric transfer
Sensor is located at the downstream of second temperature sensor 70.In other embodiments, optical sensor can also be arranged in other positions
It sets, the present invention is without limitation.
In one embodiment, processor can also control fan according to the air flow value in current gas channels
120 rotating speed, so that the air mass flow in gas channels levels off to preset value, to ensure the stabilization of gas channels interior air-flow
Property, improve accuracy of detection.Fan 120 can be connected to by harness on circuit board, so that the rotating speed of fan 120 can be fed back
To processor, and processor can control the rotating speed of fan 120.
In one embodiment, processor can also be according to the first temperature sensor 50 and/or second temperature sensor
First temperature signal of 70 outputs and/or the power of second temperature signal automatic adjustment heating element 60, so that in detection device
Portion's temperature is maintained within the scope of suitable temperature (for example, 50~60 DEG C), to improve accuracy of detection, the use of extension detection device
Service life.
For example, when the first temperature sensor 50 and/or second temperature sensor 70 detect that the temperature inside device is higher
When, the power that processor can control heating element 60 reduces；When the first temperature sensor 50 and/or second temperature sensor 70
When detecting that temperature inside device is relatively low, the power that processor can control heating element 60 increases.In this way, especially
It can ensure detection device at low ambient temperatures (for example, -20 DEG C or less) work when inside can also be maintained at suitable temperature
It spends in range, ensures that detection device (especially light source 30) can work normally.Heating element 60 can be any suitable shape
Formula, such as can be adjustable heating resistor, potsherd or the external potsherd for being enclosed with metal conducting strip.
Preferably, processor can be according to the temperature that the first temperature sensor 50 and second temperature sensor 70 detect
Average value automatically adjusts the power of heating element 60.
In one embodiment, processor can also be according to the first temperature sensor 50 and/or second temperature sensor
The opening and closing of the first temperature signal and/or second temperature signal control light source 30 of 70 outputs.When detection device works, such as
Fruit internal temperature has been more than temperature threshold (for example, 80 DEG C), and processor can control the closing of light source 30, high temperature is avoided to cause light source 30
Damage.When temperature drops in suitable range, processor control light source 30 reopens.
Preferably, processor can be according to the temperature that the first temperature sensor 50 and second temperature sensor 70 detect
Maximum constraint light source 30 is closed.
Since under normal conditions, the temperature that second temperature sensor 70 detects is detected more than the first temperature sensor 50
Temperature, therefore, processor can control the closing of light source 30 according to temperature that second temperature sensor 70 detects.For example,
When the temperature that second temperature sensor 70 detects is more than temperature threshold, processor controls light source 30 and closes.
The preferred embodiment of the present invention is described in detail above in association with attached drawing, still, the present invention is not limited to above-mentioned realities
The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical scheme of the present invention
Monotropic type, these simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (10)
1. a kind of particulate matter detection means, which is characterized in that including：
Shell (10) is provided with air inlet (104) and air outlet (105)；
The inner space of the shell (10) is separated into upper layer cavity (100) and lower layer's cavity (110), institute by partition board (20)
Upper layer cavity (100) to be stated to be connected to the air inlet (104), lower layer's cavity (110) is connected to the air outlet (105),
The ventilation opening (201) for being connected to the upper layer cavity (100) and lower layer's cavity (110) is provided on the partition board (20)；
Circuit board, setting is in the upper layer cavity (100)；
Light source (30) is mounted on the circuit board；
Photoelectric sensor (40) is mounted on the circuit board, irradiates sky by the light that the light source (30) is sent out for receiving
Light is scattered caused by gas；
Processor is mounted on the circuit board, is corresponded to for receiving the scattering light according to the photoelectric sensor (40)
The signal of output calculates the particle concentration in air；
Fan (120), setting is in lower layer's cavity (110), for generating negative pressure so that air is by the air inlet (104)
In into the shell (10).
2. particulate matter detection means according to claim 1, which is characterized in that include in the upper layer cavity (100)
Gas channels are staggeredly equipped with multiple baffles (90) in the gas channels, into the gas channels air pass through described in
The photoelectric sensor (40) is flowed through after multiple baffles (90).
3. particulate matter detection means according to claim 2, which is characterized in that parallel with partition board (20) of the circuit board
Every being formed with the gas channels side wall (80) vertical with the partition board (20), the gas channels in setting, the partition board (20)
Side wall (80) is abutted with circuit board, and the gas channels side wall (80) is separated out the gas in the partition board (20) between circuit board
Paths.
4. particulate matter detection means according to claim 1, which is characterized in that the particulate matter detection means further include wind
Shielding case (130) is fanned, fan shroud (130) setting is in lower layer's cavity (110) and is located at the fan (120)
Between partition board (20).
5. particulate matter detection means according to claim 1, which is characterized in that the shell (10) includes housing main body
(101), upper cover body (102) and lower cover (103), the partition board (20) are integrally formed with housing main body (101), the upper cover body
(102) upper end opening of the housing main body (101) is closed, the lower cover (103) is closed under the housing main body (101)
End opening.
6. particulate matter detection means according to claim 5, which is characterized in that the upper cover body (102) and lower cover
(103) it is metal material.
7. according to the particulate matter detection means described in any one of claim 1-6, which is characterized in that set on the shell (10)
At least two air inlets (104) are equipped with, include at least two gas channels, the particulate matter in the upper layer cavity (100)
Detection device includes at least two light sources (30) and at least two photoelectric sensors (40),
The gas channels are corresponded with the air inlet (104), and each gas channels connect with corresponding air inlet (104)
It is logical；
The light source (30) corresponds with the gas channels, and each light source (30) is used to inject the light sent out corresponding
Gas channels；
The photoelectric sensor (40) corresponds with the gas channels, and each photoelectric sensor (40) is arranged in corresponding gas
In paths；
The photoelectric sensor (40) corresponds with the light source (30), and each photoelectric sensor (40) is for detecting by corresponding to
Light source (30) send out light irradiation air caused by scatter light.
8. particulate matter detection means according to claim 7, which is characterized in that the quantity of the ventilation opening (201) is less than
Or the quantity equal to the gas channels.
9. particulate matter detection means according to claim 8, which is characterized in that at least two gas channels share one
A ventilation opening (201).
10. particulate matter detection means according to claim 8, which is characterized in that at least two gas channels are in institute
It states in upper layer cavity (100) and is not connected to mutually, each gas channels have respective ventilation opening (201).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810725062.7A CN108613906A (en) | 2018-07-04 | 2018-07-04 | Particulate matter detection means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810725062.7A CN108613906A (en) | 2018-07-04 | 2018-07-04 | Particulate matter detection means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108613906A true CN108613906A (en) | 2018-10-02 |
Family
ID=63666038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810725062.7A Withdrawn CN108613906A (en) | 2018-07-04 | 2018-07-04 | Particulate matter detection means |
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| Country | Link |
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| CN (1) | CN108613906A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612893A (en) * | 2018-12-29 | 2019-04-12 | 安徽春暖花开环境科技有限公司 | A kind of automobile-used laser fine particle detection device |
| CN109669013A (en) * | 2019-02-01 | 2019-04-23 | 广东美的暖通设备有限公司 | Air quality detecting device and airhandling equipment with it |
| CN111413471A (en) * | 2020-04-16 | 2020-07-14 | 沃尔德弗河北仪表科技有限公司 | Air quality monitoring device |
| CN111693421A (en) * | 2020-06-24 | 2020-09-22 | 新乡市食品药品检验所 | Robot and method for detecting environment in sterile room |
| CN113324883A (en) * | 2021-05-11 | 2021-08-31 | 罗本龙 | Embedded raise dust pollution remote monitoring ware and remote monitering system |
| CN113433046A (en) * | 2021-06-23 | 2021-09-24 | 江苏铁军软件科技有限公司 | Raise dust detecting system for job site |
-
2018
- 2018-07-04 CN CN201810725062.7A patent/CN108613906A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612893A (en) * | 2018-12-29 | 2019-04-12 | 安徽春暖花开环境科技有限公司 | A kind of automobile-used laser fine particle detection device |
| CN109669013A (en) * | 2019-02-01 | 2019-04-23 | 广东美的暖通设备有限公司 | Air quality detecting device and airhandling equipment with it |
| CN111413471A (en) * | 2020-04-16 | 2020-07-14 | 沃尔德弗河北仪表科技有限公司 | Air quality monitoring device |
| CN111693421A (en) * | 2020-06-24 | 2020-09-22 | 新乡市食品药品检验所 | Robot and method for detecting environment in sterile room |
| CN113324883A (en) * | 2021-05-11 | 2021-08-31 | 罗本龙 | Embedded raise dust pollution remote monitoring ware and remote monitering system |
| CN113433046A (en) * | 2021-06-23 | 2021-09-24 | 江苏铁军软件科技有限公司 | Raise dust detecting system for job site |
| CN113433046B (en) * | 2021-06-23 | 2022-03-08 | 江苏铁军软件科技有限公司 | Raise dust detecting system for job site |
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Application publication date: 20181002 |