CN109916789A - A kind of low concentration small particle dust investigating based on electrostatic induction - Google Patents
A kind of low concentration small particle dust investigating based on electrostatic induction Download PDFInfo
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- CN109916789A CN109916789A CN201910083263.6A CN201910083263A CN109916789A CN 109916789 A CN109916789 A CN 109916789A CN 201910083263 A CN201910083263 A CN 201910083263A CN 109916789 A CN109916789 A CN 109916789A
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Abstract
The present invention mainly proposes a kind of low concentration small particle dust investigating based on electrostatic induction, comprising: both ends are the powder dust particle channel of air inlet and air outlet respectively；Drive the blower of air to be measured high-speed motion in powder dust particle channel containing dust；The gas outlet setting is vertical with powder dust particle channel in plane where powder dust particle channel end, gas outlet；The side of powder dust particle channel head end is arranged in the air inlet；Plane where air inlet is parallel with powder dust particle channel；It further include obtaining since high-speed motion mutually collides and detection device with the quantity of electric charge of the charged particle of powder dust particle conduit wall triboelectrification.For the present invention in the low concentration small particle dust investigating of electrostatic induction, the precision for measuring low concentration small particle is more accurate for existing apparatus.
Description
Technical field
The present invention relates to dust concentration detection field, in particular to a kind of low concentration small particle powder based on electrostatic induction
Dust detection device.
Background technique
Environmental problem became increasingly conspicuous in recent years, and dust not only threatens the physical and mental health of people as one of pollution sources,
It even more explodes in certain degree, causes the economic loss that can not be estimated and casualties.Therefore, for dust concentration
Detection is particularly important.Currently, dust measurement method is divided into sampling method and non-sampling method, in sampling method filter membrane weight method and
Oscillating balance method is more accurate, but these methods are serious by such environmental effects, and can not obtain concentration value in real time.Non-
In sampling method, light extinction method is the concentration that dust in air is measured according to the attenuation degree of luminous intensity, which is only limitted to concentration
Relatively high powder concentration measurement；Light scattering method is the scattering phenomenon using light, is based on Mie scattering theory, by amplifying circuit into
Row amplification is used to calculate measurement again, can indirectly reflect the size of dust concentration；Predicted velocity method needs to consider in measurement
Whether dust particle cross-sectional distribution to be measured is in uniformly, while also requiring the flow speed stability of dusty gas very high.These
Method is excessively high to environmental requirement, while complicated operation.
Summary of the invention
The purpose of the present invention is designing a high-precision, small error, not vulnerable to environmental disturbances, operate it is relatively simple based on
The low concentration small particle dust investigating of electrostatic induction.
The present invention is that technical solution used by realizing its technical purpose is: a kind of low concentration granule based on electrostatic induction
Diameter dust investigating, comprising: both ends are the powder dust particle channel of air inlet and air outlet respectively；Drive the sky to be measured containing dust
The blower of gas high-speed motion in powder dust particle channel；The gas outlet is arranged in powder dust particle channel end, gas outlet institute
It is vertical with powder dust particle channel in plane；The side of powder dust particle channel head end is arranged in the air inlet；Where air inlet
Plane is parallel with powder dust particle channel；Further include obtain due to high-speed motion mutually collides and with powder dust particle channel wall friction
The detection device of the quantity of electric charge of the charged particle of electrification.
The present invention changes particle incidence in the low concentration small particle dust investigating of electrostatic induction on the basis of existing
Mode rotates particle inside pipeline along wall, particle is made to tend to the detection device at tube wall, for low concentration measurement compared with subject to
Really, and the structure is relatively simple, convenient for subsequent cleaning and safeguards, while lower to the constraint requirements of environment, is adapted to
Increasingly complex environment.The precision for measuring low concentration small particle is more accurate for existing apparatus.
Further, the above-mentioned low concentration small particle dust investigating based on electrostatic induction: the detection device
For an Annular electrostatic sensor, it is nested in powder dust particle channel intermediate region domain, including is arranged in powder dust particle channel inner close fitting powder
The annular electrode of grit subchannel inner wall, plane where the annular electrode are vertical with powder dust particle channel.
Further, the above-mentioned low concentration small particle dust investigating based on electrostatic induction: the detection device
In, the shielded layer of the electromagnetic interference outside insulating layer and isolation is also set gradually outside annular electrode, the annular electrode is tight
Powder dust particle vias inner walls are pasted, the insulating layer is concordant with powder dust particle channel outer wall；Shielded layer is on the outside of insulating layer；Also wrap
The TNC connector being electrically connected with annular electrode is included, the TNC connector stretches out outside the powder dust particle conduit wall.
Further, the above-mentioned low concentration small particle dust investigating based on electrostatic induction: the powder dust particle
Channel is that one section of length closed at one end is the cylindrical pipe that L inside diameter is D, and the air inlet is the circle that diameter is d
The distance in hole, air inlet edge to the closed end is L1, and the distance to gas outlet is L2, the powder dust particle channel
Length L be 10-20cm, diameter D is 4-8cm, and it be d is 1-2.7cm, L1 0,1-0.8cm that the air inlet, which is diameter,.
Further, the above-mentioned low concentration small particle dust investigating based on electrostatic induction: the drive contains powder
The air to be measured of dirt blower of high-speed motion in powder dust particle channel is the pumping wind for being mounted on powder dust particle channel gas outlet
Fan.
In low concentration small particle dust investigating based on electrostatic induction of the invention, dust particles are moved through in pipe
Cheng Zhong, the principal element for influencing particle charge amount size have material, speed, partial size and length.Unlike material could generate electrostatic
Lotus；Collision friction suffered by the faster particle of speed is bigger, and then the quantity of electric charge generated is bigger；Under same situation, particle
Partial size is smaller, and institute is electrically charged to be more obvious.The device changes particle incidence on the basis of existing, makes particle inside pipeline
It is rotated along wall, avoids central area detection inaccuracy, so that particle is tended to the detection device at tube wall, be equipped with and take out at gas outlet
Gas equipment avoids accumulation of the particle in pipeline, and it is more accurate that device measures low concentration, and the structure is relatively simple, just
It in subsequent cleaning and safeguards, while lower to the constraint requirements of environment, is adapted to increasingly complex environment.Measure low concentration
The precision of small particle is more accurate for existing apparatus.
The present invention is further detailed with reference to the accompanying drawings and detailed description.
Detailed description of the invention
Attached drawing 1 is low concentration small particle dust investigating front view of the embodiment of the present invention 1 based on electrostatic induction.
Attached drawing 2 is low concentration small particle dust investigating top view of the embodiment of the present invention 1 based on electrostatic induction.
Attached drawing 3 is 1 structure diagram of detection device of the embodiment of the present invention.
Attached drawing 4 is the specific size of 1 device of the embodiment of the present invention.
Specific embodiment
Embodiment 1, the present embodiment are a kind of low concentration small particle dust investigating based on electrostatic induction, the device
By a segment length be 16cm, diameter is 6cm one is the powder dust particle channel closing the cylindrical pipe of an opening and forming
2, as depicted in figs. 1 and 2, one extraction fan 4 is installed in open at one end and forms gas outlet 5, the side near cecum is big from cecum
The place of general 0.5cm, the round hole for opening a diameter 2cm form air inlet 1, and the outer of air inlet 1 is from cecum and venthole
Distance is 0.5cm and 13.5cm respectively.
Obtain the charge due to the charged particle that high-speed motion mutually collides and electrifies with 2 wall friction of powder dust particle channel
The detection device 3 of amount is nested in 2 middle area of powder dust particle channel as shown in figure 3, detection device 3 is an Annular electrostatic sensor
Domain, the annular electrode 7 including 2 inner close fitting powder dust particle channel of powder dust particle channel, 2 inner wall is arranged in are put down where annular electrode 7
Face is vertical with powder dust particle channel.In addition, also setting gradually insulating layer 8 outside annular electrode 7 in detection device 3 and isolation being outer
The shielded layer 9 of the electromagnetic interference in portion, shape electrode 7 are close to 6 inner wall of powder dust particle channel, insulating layer 8 and 2 outer wall of powder dust particle channel
Concordantly；Shielded layer 9 is in 8 outside of insulating layer；It further include the TNC connector 6 being electrically connected with annular electrode 8, TNC connector 6 stretches out dust
Outside particle channel (2) wall.
In the present embodiment, detection device 3 is Annular electrostatic sensor, and outermost layer to internal layer is respectively shielded layer 9, insulation
Layer 8, annular electrode 7, are nested in 2 intermediate region of powder dust particle channel, to make the insulating layer 8 and dust grain of Annular electrostatic sensor
2 outer wall of subchannel is concordant, and annular electrode 7 is close to dust passage inner wall, and shielded layer 9 completely cuts off external electromagnetism on the outside of insulating layer
It is dry reduce probe wall surface mechanical oscillation bring measurement error and prevent temperature, humidity to measuring circuit, sensor probe,
Grain static characteristic bring influences.
It is first when measuring dust concentration using the low concentration small particle dust investigating based on electrostatic induction of the present embodiment
Measured zone is first placed the device in, dust particles are pumped into powder dust particle channel 2 from air inlet 1 by extraction fan 4, particle exists
In the process of pneumatic transmission in powder dust particle channel 2, dust particles are in the quickly motion states such as flowing or vibration, and and air
Friction with duct wall, collision make particle and particle and collide in channel extruding with tube wall, and air inlet is in pipe side
Face and tangent with pipeline wall surface, powder dust particle enter pipeline and move closely along wall surface, rotation are generated, since turning effort is in pipeline
Can abundant exercise, increase phase mutual friction chance, when particulate matter pass through powder dust particle channel 2 when, powder dust particle is along tube wall
Screw increases the unit section density of particulate matter, increases the mutual collision of particulate matter, fills particle movement more
Point, turning effort in addition makes particle tend to tube wall, and it avoids intermediate region from being difficult to detect, increases the quantity of electric charge of particle, due to
Electrostatic induction produces alternating signal on electrode, and the quantity of electric charge of particle institute band is obtained by the annular electrode 7 in detection device 3, by
TNC connector 6 after carrying out processing analysis to it, and then obtains powder dust particle by the random charge signal of this flowing of acquisition
Conveying speed and dust concentration.
The low concentration small particle dust investigating based on electrostatic induction of the present embodiment is in existing measurement air
The device of powder dust particle concentration optimizes, and forms the dust movement pipeline with rotation effect, passes through the rotation to particle
Processing makes particle and particle and collides friction with tube wall, due to rotation work when particulate matter passes through 2 wall of powder dust particle channel
With with increase the particle concentration of unit cross-sectional area, to increase the charge inducing amount of particle, lead to
The electrostatic induction amount that measuring device 3 obtains particle is crossed, so as to immediately arrive at dust concentration.The powder dust particle of the present embodiment is logical
2 shape of road is cylindrical pipe, and it is gas outlet 5 far from pipe head, to dust that pipe side wall, which is equipped with air inlet 1,
The disengaging of grain object.Pipeline outer wall intermediate region one measuring device 3 of nesting, is circular ring shape electrostatic transducer, to detect particle
Charge inducing amount.It is equipped with extraction fan 4 in 5 side of gas outlet, is the air extractor of adjustable speed, to the speed control to powder dust particle
It makes and traction pulling is carried out to particle.As 2 pipeline of powder dust particle channel as shown in figure 4, its length L is 16cm, by pipeline
It is divided into two sections, dust inlet segment length L3 is 4cm, dust passage main paragraph L16cm.The device of the present embodiment can according to environment,
Corresponding overall ratio size is adjusted, dust detection environment is adapted to this.The caliber of device entrance port and main pipeline ratio d/D=
1/3, i.e. pipe diameter D are 6cm, d 2cm.
Claims (5)
1. a kind of low concentration small particle dust investigating based on electrostatic induction, comprising:
Both ends are the powder dust particle channel of air inlet and air outlet respectively；
Drive the blower of air to be measured high-speed motion in powder dust particle channel containing dust；It is characterized by: the outlet
In powder dust particle channel (2) end, plane where gas outlet (5) is vertical with powder dust particle channel (2) for mouth (5) setting；Described
Air inlet (1) is arranged in the side of powder dust particle channel (2) head end；Plane and powder dust particle channel (2) where air inlet (1)
In parallel；
It further include obtaining due to the charged particle that high-speed motion mutually collides and electrifies with powder dust particle channel (2) wall friction
The detection device (3) of the quantity of electric charge.
2. the low concentration small particle dust investigating according to claim 1 based on electrostatic induction, it is characterised in that: institute
The detection device (3) stated is an Annular electrostatic sensor, is nested in powder dust particle channel (2) intermediate region, including be arranged in powder
The annular electrode (7) of grit subchannel (2) inner close fitting powder dust particle channel (2) inner wall, the annular electrode (7) place are flat
Face is vertical with powder dust particle channel.
3. the low concentration small particle dust investigating according to claim 2 based on electrostatic induction, it is characterised in that: institute
In the detection device (3) stated, the screen of the electromagnetic interference outside insulating layer (8) and isolation is also set gradually outside in annular electrode (7)
It covers layer (9), the annular electrode (7) is close to powder dust particle channel (2) inner wall, and the insulating layer (8) and powder dust particle are logical
Road (2) outer wall is concordant；Shielded layer (9) is on the outside of insulating layer (8)；It further include the TNC connector (6) being electrically connected with annular electrode (7),
The TNC connector (6) stretches out outside described powder dust particle channel (2) wall.
4. the low concentration small particle dust investigating according to claim 1 based on electrostatic induction, it is characterised in that: institute
The powder dust particle channel (2) stated is that one section of length closed at one end is the cylindrical pipe that L inside diameter is D, the air inlet
Mouthful (1) is the circular hole that diameter is d, and the distance of the air inlet (1) edge to closed end is L1, arrive gas outlet (5) away from
From being L2, the length L in the powder dust particle channel (2) is 10-20cm, and diameter D is 4-8cm, and the air inlet (1) is straight
Diameter is that d is 1-2.7cm, L1 0,1-0.8cm.
5. special according to claim 1 to any low concentration small particle dust investigating based on electrostatic induction in 4
Sign is: to be measured air of the drive containing dust is to be mounted on powder in the blower of powder dust particle channel (2) interior high-speed motion
The extraction fan (4) of grit subchannel (2) gas outlet (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910083263.6A CN109916789A (en) | 2019-01-29 | 2019-01-29 | A kind of low concentration small particle dust investigating based on electrostatic induction |
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| CN201910083263.6A CN109916789A (en) | 2019-01-29 | 2019-01-29 | A kind of low concentration small particle dust investigating based on electrostatic induction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116380740A (en) * | 2023-05-16 | 2023-07-04 | 江苏省环境监测中心 | Waste gas concentration detection mechanism and use method thereof |
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| CN102435237A (en) * | 2011-10-27 | 2012-05-02 | 天津大学 | Gas-solid two-phase flow parameter detector |
| CN103454195A (en) * | 2013-09-27 | 2013-12-18 | 山东科技大学 | Mine dust concentration sensor based on electrostatic induction |
| CN105921276A (en) * | 2016-05-23 | 2016-09-07 | 中国矿业大学 | Fine particle rotational flow type electric agglomeration dust removing and collecting device |
| JP2017096827A (en) * | 2015-11-26 | 2017-06-01 | 東京エレクトロン株式会社 | Particle concentration mechanism, particle measurement device, and substrate processing device equipped with particle measurement device |
| CN108120602A (en) * | 2017-12-11 | 2018-06-05 | 南京航空航天大学 | A kind of aero-engine air intake duct sand dust inhalation (inhalatio) electrostatic monitoring experimental bench |
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2019
- 2019-01-29 CN CN201910083263.6A patent/CN109916789A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435237A (en) * | 2011-10-27 | 2012-05-02 | 天津大学 | Gas-solid two-phase flow parameter detector |
| CN103454195A (en) * | 2013-09-27 | 2013-12-18 | 山东科技大学 | Mine dust concentration sensor based on electrostatic induction |
| JP2017096827A (en) * | 2015-11-26 | 2017-06-01 | 東京エレクトロン株式会社 | Particle concentration mechanism, particle measurement device, and substrate processing device equipped with particle measurement device |
| CN105921276A (en) * | 2016-05-23 | 2016-09-07 | 中国矿业大学 | Fine particle rotational flow type electric agglomeration dust removing and collecting device |
| CN108120602A (en) * | 2017-12-11 | 2018-06-05 | 南京航空航天大学 | A kind of aero-engine air intake duct sand dust inhalation (inhalatio) electrostatic monitoring experimental bench |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116380740A (en) * | 2023-05-16 | 2023-07-04 | 江苏省环境监测中心 | Waste gas concentration detection mechanism and use method thereof |
| CN116380740B (en) * | 2023-05-16 | 2023-08-08 | 江苏省环境监测中心 | Waste gas concentration detection mechanism and use method thereof |
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Application publication date: 20190621 |
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