CN108613907A - Particulate matter detection means - Google Patents
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- CN108613907A CN108613907A CN201810726481.2A CN201810726481A CN108613907A CN 108613907 A CN108613907 A CN 108613907A CN 201810726481 A CN201810726481 A CN 201810726481A CN 108613907 A CN108613907 A CN 108613907A
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- 238000001514 detection method Methods 0.000 title claims abstract description 96
- 239000013618 particulate matter Substances 0.000 title claims abstract description 55
- 238000010438 heat treatment Methods 0.000 claims abstract description 48
- 239000002245 particle Substances 0.000 claims abstract description 24
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 10
- 238000009423 ventilation Methods 0.000 claims description 26
- 238000005192 partition Methods 0.000 claims description 23
- 239000012491 analyte Substances 0.000 claims description 4
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- 238000004887 air purification Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 208000002925 dental caries Diseases 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 239000002184 metal Substances 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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- 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
- G01N2015/0681—Purposely modifying particles, e.g. humidifying for growing
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Abstract
The present invention relates to a kind of particulate matter detection means, including：Gas channels；Fan, for driving outside air to enter gas channels；Heating element is arranged in gas channels, for heating air；First, second temperature sensor is arranged in gas channels and is located at the upstream and downstream of heating element, for detecting corresponding air themperature and generating the first, second temperature signal；Light source, for emitting light into gas channels；Photoelectric sensor, for receiving scattering light caused by the air in light source irradiation gas channels and exporting electric signal；Processor, for calculating particle concentration according to electric signal, the first temperature signal and second temperature signal.By the combination of heating element and temperature sensor, the actual air flow in gas channels can be effectively calculated, particle concentration is calculated using actual air flow as parameter can make testing result more accurate, to improve accuracy of detection.
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 the light scattering method testing time is short, can continuously measure, avoid
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.
For carrying out the detection device of particle concentration detection using light scattering method, device inner air flow size
Change have significant impact to testing result.However, existing particulate matter detection means are only with preset air mass flow
Particle concentration is calculated as parameter, actual air flow is not considered, leads to that there are the lower defects of accuracy of detection.
In addition, existing particulate matter detection means can not use at low ambient temperatures, temperature is too low to be caused inside device
Light source damage.And inside device when the temperature is excessively high, light source damage is also resulted in, the service life of device is influenced.
Invention content
The object of the present invention is to provide a kind of accuracy of detection higher, the particulate matter detection means that the service life is longer.
To achieve the goals above, the present invention provides a kind of particulate matter detection means, including：
Gas channels；
Fan, for driving air into the gas channels；
Heating element is arranged in the gas channels, for heating air；
First temperature sensor is arranged in the gas channels and is located at the upstream of the heating element, for detecting
It flows through the temperature of air and generates corresponding first temperature signal；
Second temperature sensor is arranged in the gas channels and is located at the downstream of the heating element, for detecting
It flows through the temperature of air and generates corresponding second temperature signal；
Light source, for emitting light into the gas channels；
Photoelectric sensor scatters light for receiving caused by the air that the light source irradiates in the gas channels, and
Corresponding output electric signal；
Processor, electric signal, first temperature signal and described second for being exported according to the photoelectric sensor
Temperature signal calculates the particle concentration in air.
Optionally, the processor is used to determine described add according to first temperature signal and the second temperature signal
The upstream air of thermal element and the temperature of air downstream and temperature difference, the gas channels are determined according to the temperature and temperature difference
Interior air flow value, it is dense that the electric signal exported according to the air flow value and the photoelectric sensor calculates particulate matter
Degree.
Optionally, the processor is additionally operable to according to described in first temperature signal and second temperature signal determination
The upstream air of heating element and the temperature of air downstream and temperature difference determine that the gas circuit is logical according to the temperature and temperature difference
Air flow value in road, and control the fan rotating speed so that the air flow value in the gas channels level off to it is default
Value.
Optionally, the processor controls the opening and closing of the light source according to the first temperature signal and/or second temperature signal
And adjust the power of the heating element.
Optionally, the processor determines the heating unit according to first temperature signal and the second temperature signal
The upstream air of part and the maximum temperature of air downstream and mean temperature；The processor is according to described in maximum temperature control
Light source is closed and the processor adjusts the power of heating element according to the mean temperature.
Optionally, the photoelectric sensor is arranged in the gas channels and under the second temperature sensor
Trip.
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 particulate matter detection means include at least two gas channels, and each gas channels have respective
Light source, photoelectric sensor, heating element, the first temperature sensor and second temperature sensor.
Optionally, the particulate matter detection means further include shell and partition board, and the partition board is empty by the inside of the shell
Between be separated into upper layer cavity and lower layer's cavity, the ventilation for being connected to the upper layer cavity and lower layer's cavity is provided on the partition board
Mouthful, at least two gas channels are formed in the upper chamber body, and the fan is arranged in lower layer's cavity.
Optionally, be provided with air outlet and at least two air inlets on the shell, each gas channels with it is corresponding into
Air port is connected to, and at least two gas channels share a ventilation opening, and the negative pressure that the fan generates makes to have leisure
Gas enters the upper layer cavity by least two air inlet, then by ventilation opening arrival lower layer's cavity, and by
The air outlet outflow.
Optionally, be provided with air outlet and at least two air inlets on the shell, each gas channels with it is corresponding into
Air port is connected to, and at least two gas channels are not connected to mutually in the upper chamber body, and each gas channels have respective
Ventilation opening, the negative pressure that the fan generates make outside air enter the upper layer cavity by least two air inlet, then
Lower layer's cavity is reached by the respective ventilation opening, and is flowed out by the air outlet.
By the combination of heating element 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 the combination of heating element and temperature sensor, cost is more
It is low, it is convenient for actual production and application.Moreover, in the combination, heating element can be in low temperature in particulate matter detection means
The detection device is internally heated when under environment, to ensure that particulate matter detection means at low ambient temperatures can also be normal
Work.
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 gas circuit
Channel, light source 30, photoelectric sensor 40, heating element 60, the first temperature sensor 50, second temperature sensor 70, processor
With fan 120.
In the darkroom of gas channels setting in the device, avoid being influenced by ambient light.Fan 120 is for driving extraneous sky
Gas enters gas channels and is flowed along gas channels.Light source 30 is arranged in the side of gas channels, and to gas channels irradiation light
The air in gas channels is set to generate scattering light.Photoelectric sensor 40 is arranged in the position that can receive scattering light.
When particulate matter detection means work, fan 120 rotates, and outside air enters gas channels, when containing in air stream
When particulate matter, the light that light source 30 is sent out is radiated at generation scattering formation scattering light on particulate matter, this scattering light is by photoelectric sensing
Device 40 receives, and corresponding optical signal is converted into electric signal by photoelectric sensor 40 according to the scattering light received, and by the electricity
Signal is sent to processor.
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.
As shown in Fig. 3, Fig. 5, Fig. 6 and Fig. 8, heating element 60, the first temperature sensor 50 and second temperature sensor 70
It is arranged in gas channels, also, along air-flow direction, the first temperature sensor 50 is located at the upstream of heating element 60, the
Two temperature sensors 70 are located at the downstream of heating element 60, that is to say, that each there are one temperature sensing for heating element 60 front and back
Device.First temperature sensor 50, second temperature sensor 70 are used to detect the corresponding temperature for flowing through air, the first temperature sensor
50 and second temperature sensor 70 generated according to the temperature of detection and detect relevant first temperature signal of temperature and second temperature
Signal, and first temperature signal and second temperature signal are sent to processor.Processor can be further according to photoelectric transfer
Electric signal, the first temperature signal and the second temperature signal that sensor 40 exports calculate the concentration of particulate matter.
When particulate matter detection means work, heating element 60 can heat the air in gas channels, and heating element 60 is upper and lower
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 the air velocity in gas channels is zero, two
The air themperature that a temperature sensor detects 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 70 to atmospheric heat center increases.
Within the scope of certain air velocity, air velocity is faster, and the distance that atmospheric heat center elapses forward is bigger, and second
The distance at temperature sensor 70 to atmospheric heat center is smaller, and the distance at the first temperature sensor 70 to atmospheric heat center is got over
Greatly.That is, within the scope of certain air velocity, air velocity is faster, then the Air Temperature that two temperature sensors detect
The temperature difference of degree is bigger；Air velocity 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 electric signal of corresponding output after scattering light
Calculate particle concentration.
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.
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.
In the present invention, it by the combination of heating element and temperature sensor, can effectively calculate in gas channels
Actual air flow, particle concentration is calculated using actual air flow as parameter can make testing result more accurate, to carry
High measurement accuracy.Compared to general air flow meter, using the occupied space of the combination of heating element and temperature sensor
Smaller, cost is lower, is convenient for actual production and application.Moreover, in the combination, heating element can be filled in particle analyte detection
The detection device is internally heated when setting under low temperature environment, to ensure particulate matter detection means at low ambient temperatures
It can also work normally.
In one embodiment, as shown in Figure 3 and Figure 6, photoelectric sensor 40 is arranged in gas channels, and along sky
Flow of air direction, photoelectric sensor 40 are located at the downstream of second temperature sensor 70.In other embodiments, photoelectric sensor
40 can also be arranged in other positions, and the present invention is without limitation.
In one embodiment, as shown in Figure 3 and Figure 6, multiple baffles 90 are staggeredly equipped in gas channels, in air
On flow direction, photoelectric sensor 40 is arranged in the downstream of multiple baffle 90, and the outside air into the gas channels passes through
Cross that multiple baffle is after 90s to flow through photoelectric sensor 40.Due to the presence of baffle 90 so that air stream is not in gas channels
Smooth flowing, but need to bypass corresponding baffle 90, therefore baffle 90 can effectively stop that the sundries such as batting enter
Accuracy of detection is influenced 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, particulate matter detection means include two
A gas channels, each gas channels have respective light source 30, photoelectric sensor 40, heating element 60, the first temperature sensing
Device 50 and second temperature sensor 70.When detection device works, the rotation of fan 120 generates negative pressure, air under the action of negative pressure
Stream enters two gas channels, and each gas channels have respective light source 30 and photoelectric sensor 40, to realize one
Grain analyte detection device can detect the function of two-way air-flow particulate matter simultaneously.
In this embodiment, since there are two gas channels for tool inside detection device, a kind of environment is being detected
When particle concentration under occasion, can jointly it be detected with two gas channels, processor is according to the light in two gas channels
The electric signal that electric transducer 40 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 two 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 another 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, another gas channels can be opened and verified, determine whether be
Due to caused by 40 failure of photoelectric sensor.
Here, two 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 two gas channels, improves accuracy of detection.
Certainly, in practical applications, three or three or more gas channels can be set in particulate matter detection means with reality
An existing particulate matter detection means are carried out at the same time the work of the particle analyte detection under a variety of environment occasions, have in each gas channels
There are corresponding light source 30 and photoelectric sensor 40.In this way, it is possible to detect the particulate matter in multiple and different environment spaces simultaneously
Concentration realizes that a device detects multiple spaces, or in the case where requiring high to accuracy of detection, multiple gas channels can
A kind of environment space is only detected simultaneously, and particle concentration is determined after the testing result of the multiple gas channels of comprehensive analysis.
For the structure of particulate matter detection means, can have any suitable structure type, the present invention not to limit this
System.
In one embodiment, as depicted in figs. 1 and 2, detection device further includes shell 10, partition board 20 and circuit board,
There are two air inlet 104 and an air outlet 105, partition board 20 is arranged in shell 10 for setting on shell 10, and partition board 20 is by shell
10 inner space is separated into upper layer cavity 100 and lower layer's cavity 110, wherein and upper layer cavity 100 is connected to air inlet 104, under
Layer cavity 110 is connected to air outlet 105.The ventilation opening of connection upper layer cavity 100 and lower layer's cavity 110 is provided on partition board 20
201.Fan 120 can be connected to by harness on circuit board, so that the rotating speed of fan 120 can feed back to processor, and
And processor can control the rotating speed of fan 120.
For only there are two the particulate matter detection means of gas channels, two gas channels are formed in upper layer cavity 100,
Gas channels are corresponded with air inlet 104, and each gas channels are connected to corresponding air inlet 104.Light source 30 is logical with gas circuit
Road corresponds, and each light source 30 is used to the light sent out injecting corresponding gas channels.Photoelectric sensor 40 and light source 30
It corresponds, each photoelectric sensor 40 is used to detect to be scattered caused by the light irradiation air sent out by corresponding light source 30
Light.
Circuit board is arranged in upper layer cavity 100, light source 30, photoelectric sensor 40, heating element 60, the first temperature sensing
Device 50, second temperature sensor 70 and processor installation are on circuit boards.Fan 120 is arranged in lower layer's cavity 110, fan
Negative pressure is generated when 120 work so that outside air enters upper layer cavity 100 by air inlet 104, then is reached by ventilation opening 201 described
Lower layer's cavity 110 is finally flowed out by air outlet 105.
In this embodiment, particulate matter detection means are functionally divided into upper and lower two cavitys, 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 inspection
Survey region, circuit board, light source 30, photoelectric sensor 40, heating element 60, the first temperature sensor 50, second temperature sensor
70 and processor loaded in upper layer cavity 100 for detecting particle concentration.In practical application, in upper and lower layer cavity 100,110
The device of installation 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 when fan 120 works to detection part, improves accuracy of detection；On the other hand, upper and lower hierarchical design
The appearance and size that detection device can be reduced keeps the length, width and height of detection device more balanced, in order to install, if by fan
120 and detection part be placed on same layer, length and/or the width that will result in detection device are bigger, are not easy to the reality of product
It applies on border.Here, detection device can be in integrally any suitable shapes such as cube, cylinder, Elliptic Cylinder.
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 and lower cover 103 are metal material, external interference can be shielded,
Further increase accuracy of detection.Housing main body 101 and partition board 20 can be by being integrally formed.Here, by making shell master
103 split settings of body 101, upper cover body 102 and lower cover, and housing main body 101 and partition board 20 is made to be integrally formed, can be in order to
The manufacturing of particulate matter detection means simplifies assembling, while reducing production cost.
In order to keep detection device internal structure more compact, in one embodiment, as shown in Figure 3 and Figure 6, two gas circuits
Channel is symmetrical arranged in upper layer cavity 100.
The present invention of quantity in to(for) ventilation opening 201 is not limited, ventilation opening 201 can with one, two it is even more.
The quantity of ventilation opening 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.In one kind
In 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 hangs down with partition board 20
Straight gas channels side wall 80, gas channels side wall 80 are abutted with circuit board, by gas channels side wall 80 in partition board 20 and electricity
It is separated out gas channels between the plate of road.In this case, as shown in Figure 3 and Figure 6, gas channels side wall 80 can be formed in every
Reinforcing rib on plate 20, baffle 90 can be formed on gas channels side wall 80, that is to say, that gas channels side wall 80, baffle
90, partition board 20 and housing main body 101 can be integrally formed, consequently facilitating the manufacturing of particulate matter detection means.
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 (11)
1. a kind of particulate matter detection means, which is characterized in that including：
Gas channels；
Fan (120), for driving air into the gas channels；
Heating element (60) is arranged in the gas channels, for heating air；
First temperature sensor (50) is arranged in the gas channels and positioned at the upstream of the heating element (60), is used for
Detection flows through the temperature of air and generates corresponding first temperature signal；
Second temperature sensor (70) is arranged in the gas channels and positioned at the downstream of the heating element (60), is used for
Detection flows through the temperature of air and generates corresponding second temperature signal；
Light source (30), for emitting light into the gas channels；
Photoelectric sensor (40) is scattered for receiving caused by the air that the light source (30) irradiates in the gas channels
Light, and corresponding output electric signal；
Processor, electric signal, first temperature signal and described second for being exported according to the photoelectric sensor (40)
Temperature signal calculates the particle concentration in air.
2. particulate matter detection means according to claim 1, which is characterized in that the processor is used for according to described first
Temperature signal and the second temperature signal determine the upstream air of the heating element (60) and the temperature and temperature of air downstream
Degree it is poor, the air flow value in the gas channels is determined according to the temperature and temperature difference, according to the air flow value with
The electric signal of photoelectric sensor (40) output calculates particle concentration.
3. particulate matter detection means according to claim 1, which is characterized in that the processor is additionally operable to according to described
One temperature signal and the second temperature signal determine the upstream air of the heating element (60) and the temperature of air downstream and
Temperature difference determines the air flow value in the gas channels according to the temperature and temperature difference, and controls the fan (120)
Rotating speed so that the air flow value in the gas channels levels off to preset value.
4. particulate matter detection means according to claim 1, which is characterized in that the processor is according to the first temperature signal
And/or second temperature signal controls the opening and closing of the light source (30) and adjusts the power of the heating element (60).
5. particulate matter detection means according to claim 4, which is characterized in that the processor is according to first temperature
Signal and the second temperature signal determine the upstream air of the heating element (60) and the maximum temperature of air downstream and put down
Equal temperature；
The processor controls the light source (30) according to the maximum temperature and closes, and
The processor adjusts the power of heating element (60) according to the mean temperature.
6. particulate matter detection means according to claim 1, which is characterized in that the photoelectric sensor (40) is arranged in institute
State the downstream in gas channels and positioned at the second temperature sensor (70).
7. particulate matter detection means according to claim 1, which is characterized in that be staggeredly equipped in the gas channels more
A baffle (90), the air into the gas channels flow through the photoelectric sensor after the multiple baffle (90)
(40)。
8. according to the particulate matter detection means described in any one of claim 1-7, which is characterized in that the particle analyte detection dress
It sets including at least two gas channels, each gas channels have respective light source (30), photoelectric sensor (40), heating element
(60), the first temperature sensor (50) and second temperature sensor (70).
9. particulate matter detection means according to claim 8, which is characterized in that the particulate matter detection means further include outer
Shell (10) and partition board (20), the partition board (20) by the inner space of the shell (10) be separated into upper layer cavity (100) and under
Layer cavity (110) is provided with the ventilation opening for being connected to the upper layer cavity (100) and lower layer's cavity (110) on the partition board (20)
(201), at least two gas channels are formed in the upper layer cavity (100), and the fan (120) is arranged under described
In layer cavity (110).
10. particulate matter detection means according to claim 9, which is characterized in that be provided with outlet air on the shell (10)
Mouth (105) and at least two air inlets (104), each gas channels and corresponding air inlet (104) are connected to,
At least two gas channels share a ventilation opening (201), and the negative pressure that the fan (120) generates makes to have leisure
Gas enters the upper layer cavity (100) by least two air inlet (104), then reaches institute by the ventilation opening (201)
Lower layer's cavity (110) is stated, and is flowed out by the air outlet (105).
11. particulate matter detection means according to claim 9, which is characterized in that be provided with outlet air on the shell (10)
Mouth (105) and at least two air inlets (104), each gas channels and corresponding air inlet (104) are connected to,
At least two gas channels are not connected to mutually in the upper layer cavity (100), and each gas channels have respective
Ventilation opening (201), the negative pressure that the fan (120) generates make air described at least two air inlet (104) entrance
Upper layer cavity (100), then lower layer's cavity (110) is reached by the respective ventilation opening (201), and by the air outlet
(105) it flows out.
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| CN201810726481.2A CN108613907A (en) | 2018-07-04 | 2018-07-04 | Particulate matter detection means |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109611369A (en) * | 2019-01-16 | 2019-04-12 | 北京英视睿达科技有限公司 | Monitor control method and device |
| CN111920305A (en) * | 2020-08-07 | 2020-11-13 | 湖南因思特电器有限责任公司 | Nutrient solid soluble type water dispenser |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02162239A (en) * | 1988-12-15 | 1990-06-21 | Ikeda Denki Kk | Flow-rate control apparatus of specimen air in particulate detecting apparatus |
| CN104360419A (en) * | 2014-11-20 | 2015-02-18 | 北京中立格林控制技术有限公司 | Multi-parameter sensing module |
| CN204613066U (en) * | 2015-05-29 | 2015-09-02 | 济南诺方电子技术有限公司 | A kind of dust detecting sensor based on LASER Light Source |
| CN105181544A (en) * | 2015-09-21 | 2015-12-23 | 劲天环境科技（上海）有限公司 | Detection device and detection method for concentration of particulate matter in air |
| US20160025628A1 (en) * | 2014-07-24 | 2016-01-28 | Samsung Electronics Co., Ltd. | Mobile device which senses particulate matter and method of sensing particulate matter with the mobile device |
| CN205538672U (en) * | 2016-04-26 | 2016-08-31 | 黑龙江科技大学 | Particulate matter volume concentration detection device in air based on laser light scattering principle |
| CN205656094U (en) * | 2015-09-21 | 2016-10-19 | 劲天环境科技（上海）有限公司 | Detection apparatus for particulate matter concentration in air |
| CN106442249A (en) * | 2016-10-27 | 2017-02-22 | 广东奥迪威传感科技股份有限公司 | Dust detection device |
| CN107036946A (en) * | 2017-04-28 | 2017-08-11 | 江苏大学 | Solid particulate matter concentration detection apparatus under a kind of high humidity environment |
| CN107356505A (en) * | 2017-08-28 | 2017-11-17 | 南京中科乾安智能科技有限公司 | Particle concentration sensor and sensor-based system |
| 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 |
| CN208420627U (en) * | 2018-07-04 | 2019-01-22 | 汉王科技股份有限公司 | Particulate matter detection means |
-
2018
- 2018-07-04 CN CN201810726481.2A patent/CN108613907A/en not_active Withdrawn
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02162239A (en) * | 1988-12-15 | 1990-06-21 | Ikeda Denki Kk | Flow-rate control apparatus of specimen air in particulate detecting apparatus |
| US20160025628A1 (en) * | 2014-07-24 | 2016-01-28 | Samsung Electronics Co., Ltd. | Mobile device which senses particulate matter and method of sensing particulate matter with the mobile device |
| CN104360419A (en) * | 2014-11-20 | 2015-02-18 | 北京中立格林控制技术有限公司 | Multi-parameter sensing module |
| CN204613066U (en) * | 2015-05-29 | 2015-09-02 | 济南诺方电子技术有限公司 | A kind of dust detecting sensor based on LASER Light Source |
| CN105181544A (en) * | 2015-09-21 | 2015-12-23 | 劲天环境科技（上海）有限公司 | Detection device and detection method for concentration of particulate matter in air |
| CN205656094U (en) * | 2015-09-21 | 2016-10-19 | 劲天环境科技（上海）有限公司 | Detection apparatus for particulate matter concentration in air |
| CN205538672U (en) * | 2016-04-26 | 2016-08-31 | 黑龙江科技大学 | Particulate matter volume concentration detection device in air based on laser light scattering principle |
| CN106442249A (en) * | 2016-10-27 | 2017-02-22 | 广东奥迪威传感科技股份有限公司 | Dust detection device |
| CN107036946A (en) * | 2017-04-28 | 2017-08-11 | 江苏大学 | Solid particulate matter concentration detection apparatus under a kind of high humidity environment |
| 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 |
| CN107356505A (en) * | 2017-08-28 | 2017-11-17 | 南京中科乾安智能科技有限公司 | Particle concentration sensor and sensor-based system |
| CN208420627U (en) * | 2018-07-04 | 2019-01-22 | 汉王科技股份有限公司 | Particulate matter detection means |
Non-Patent Citations (1)
| Title |
|---|
| 赵鑫;潘晋孝;刘宾;陈平;: "基于β射线吸收法的PM2.5测量技术的研究", 电子技术应用, no. 09, 6 September 2013 (2013-09-06) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109611369A (en) * | 2019-01-16 | 2019-04-12 | 北京英视睿达科技有限公司 | Monitor control method and device |
| CN111920305A (en) * | 2020-08-07 | 2020-11-13 | 湖南因思特电器有限责任公司 | Nutrient solid soluble type water dispenser |
| CN111920305B (en) * | 2020-08-07 | 2022-04-26 | 钟志华 | Nutrient solid soluble type water dispenser |
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