CN108663240A - Atmospheric particulates sample current divider - Google Patents
Atmospheric particulates sample current divider Download PDFInfo
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- CN108663240A CN108663240A CN201810690593.7A CN201810690593A CN108663240A CN 108663240 A CN108663240 A CN 108663240A CN 201810690593 A CN201810690593 A CN 201810690593A CN 108663240 A CN108663240 A CN 108663240A
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- 238000005070 sampling Methods 0.000 claims abstract description 98
- 230000007704 transition Effects 0.000 claims abstract description 27
- 239000011148 porous material Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 abstract description 19
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 239000013618 particulate matter Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000003189 isokinetic effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2273—Atmospheric sampling
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a kind of Atmospheric particulates to sample current divider, belongs to atmosphere particle monitoring field, which includes sequentially connected air inlet pipe from top to bottom, First Transition section, sampling section, the second changeover portion and evacuated tube, wherein：The internal diameter of the First Transition section gradually increases from top to bottom；The internal diameter of the sampling section and the value of the internal diameter of the air inlet pipe make sample gas flow velocity after First Transition section enters sampling section be reduced to 0.098m/s；The internal diameter of second changeover portion is gradually reduced from top to bottom；The both sides of the evacuated tube are arranged symmetrically, and there are two bypass ducts, the bypass duct is put in the sampling section and bottom end first height of the thief hatch of the bypass duct apart from the sampling section, the internal diameter of the bypass duct is 8mm, and the sample throughput of the bypass duct is less than or equal to 5L/min.Sampling efficiency of the present invention is high, and applicable particle size range is wide.
Description
Technical field
The present invention relates to atmosphere particle monitoring fields, particularly relate to a kind of Atmospheric particulates sampling current divider.
Background technology
Two or more Atmospheric particulates analytical instrument common sparing sampling systems, have the advantages that various aspects, such as increase
Sampling flow reduces divergence loss of the small size particle in pipeline, shortens in gas circuit and sample the residence time, make monitoring result
It is more identical with real atmosphere situation；Ensure that relevant equipment institute sample thief is identical, reduces sampling difference；Reduce roof punching
Number, laid convenient for gas circuit etc..The effect for sampling current divider is by sample gas by being divided into multichannel all the way, is analyzed for multiple devices.
For particle monitoring equipment, share that diverter designs that sampling gas circuit need to use are improper to generate resistance to sample gas, from
And the sampling efficiency of particulate matter is influenced, the reduction of sampling efficiency can cause sampling representativeness poor, finally influence detection accuracy.
Domestic current divider is not consider particle loss or the part flow arrangement without particulate matter gas at present, without needle
To the current divider of particle sampling；Such part flow arrangement is larger to the loss of particulate matter, and part particles things loss late can be big
In 50%, demand of the atmosphere particle monitoring equipment to sampling representativeness cannot be satisfied.
Invention content
In order to solve the above technical problems, the present invention provides a kind of Atmospheric particulates sampling current divider, sampling efficiency of the present invention
Height, applicable particle size range are wide.
It is as follows that the present invention provides technical solution：
A kind of Atmospheric particulates sampling current divider, including sequentially connected air inlet pipe, First Transition section, sampling from top to bottom
Section, the second changeover portion and evacuated tube, wherein：
The internal diameter of the First Transition section gradually increases from top to bottom, the upper-end inner diameter of the First Transition section with it is described into
The internal diameter of tracheae is identical, and the bottom diameter of the First Transition section is identical as the sampling internal diameter of section；It is described to sample the interior of section
The value of diameter and the internal diameter of the air inlet pipe makes sample gas flow velocity after First Transition section enters sampling section be reduced to 0.0
98m/s；
The internal diameter of second changeover portion is gradually reduced from top to bottom, and the upper-end inner diameter of second changeover portion is less than or waits
In the internal diameter of the sampling section, the bottom diameter of second changeover portion is identical as the internal diameter of the evacuated tube；
The both sides of the evacuated tube are symmetrical arranged there are two bypass duct, and the bypass duct is put in the sampling section and institute
Bottom end first height of the thief hatch of bypass duct apart from the sampling section is stated, the internal diameter of the bypass duct is 8mm, the bypass duct
Sample throughput be less than or equal to 5L/min.
Further, first height is the half of the height of the sampling section.
Further, the bypass duct is provided with interval, the upper end position of second changeover portion with the sampling section side
Between two bypass ducts, the bypass duct and the upper end-face edge of second changeover portion are provided with interval.
Further, the air inlet pipe and First Transition section are structure as a whole；The sampling section, the second changeover portion and emptying
Pipe is structure as a whole；First Transition section lower end is provided with the first flange, and the sampling section upper end is provided with the second flange, institute
It states the first flange and the second flange is bolted, sealing ring is provided between first flange and the second flange.
Further, the lower end of the sampling section is provided with branch pore, and the bypass duct is welded on branch pore.
Further, the material of the Atmospheric particulates sampling current divider is stainless steel, inner surface polishing treatment.
Further, the internal diameter of the air inlet pipe is 12.7mm, and the opening angle of the First Transition section is 90 degree, described
The internal diameter for sampling section is 60mm, and the height of the sampling section is 50mm.
Further, the thickness of the bypass duct is less than or equal to 2mm, and the axial line distance of two bypass ducts is 40mm；It is described
The opening angle of second changeover portion is 60 degree, and the upper-end inner diameter of second changeover portion is 24mm；The internal diameter of the evacuated tube is
8mm。
The invention has the advantages that：
The Atmospheric particulates sampling current divider particle sampling of the present invention is efficient, and applicable particle size range is wide.
Description of the drawings
Fig. 1 is that the Atmospheric particulates of the present invention sample current divider schematic diagram.
Specific implementation mode
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
The present invention provides a kind of Atmospheric particulates and samples current divider, as shown in Figure 1, including from top to bottom it is sequentially connected into
Tracheae 1, First Transition section 2, sampling section 3, the second changeover portion 4 and evacuated tube 5, wherein：
The internal diameter of First Transition section 2 gradually increases from top to bottom, and the upper-end inner diameter of First Transition section 2 is interior with air inlet pipe 1
Diameter is identical, and the bottom diameter of First Transition section 2 is identical as the sampling internal diameter of section 3；Sample the internal diameter of the internal diameter and air inlet pipe 1 of section 3
Value make sample gas by First Transition section 2 enter sampling section 3 after flow velocity be reduced to 0.098m/s；
The internal diameter of second changeover portion 4 is gradually reduced from top to bottom, and the upper-end inner diameter of the second changeover portion 4 is less than or equal to sampling
The internal diameter of section 3, the bottom diameter of the second changeover portion 4 are identical as the internal diameter of evacuated tube 5；
The both sides of evacuated tube 5 are symmetrical arranged there are two bypass duct 6, and bypass duct 6 is put in sampling section 3 and bypass duct 6
Bottom end the first height h of 7 distance samples section 3 of thief hatch, the internal diameter of bypass duct 6 are 8mm, and the sample throughput of bypass duct 6 is less than etc.
In 5L/min.
The process that sample gas is shunted in current divider can be understood as the process that bypass duct is sampled in current divider intracavitary, bypass duct
Upper port is thief hatch, the sampling resistance of resistance, that is, branch thief hatch of current divider.Sampling resistance be divided into thief hatch resistance with
Transport resistance, thief hatch resistance are made of suction resistance and entrance transport resistance again, when general suction resistance is big, transport resistance
Greatly.The resistance that different diversion structure designs generate differs greatly, different service conditions, sampling efficiency computational methods with adopt
Sample efficiency is different.Existing research shows that coaxial, isokinetic sampling is ideal sample mode, to arbitrary grain size section
Particle sampling efficiency can reach 100%, but its use condition is more harsh, be difficult to realize.The present invention uses slow flow velocity
The mode of air sampling, rationally designs current divider, makes it to the particle sampling suction efficiency of different-grain diameter section one
Reach 95% or more within the scope of constant flow.
When in use, sample gas enters current divider to the Atmospheric particulates sampling current divider of the present invention from air inlet pipe, by first
When changeover portion, since the internal diameter of First Transition section gradually increases from top to bottom, the flow velocity of sample gas continuously decreases, and is adopted when sample gas enters
After sample section, since the internal diameter of sampling section is much larger than the internal diameter of (tens times) air inlet pipe so that sample gas velocity is reduced to 0.098m/s,
Meet the requirement of slow flow rate air sampling.
Then sample gas is sucked in sampling section by two bypass ducts, and is transmitted to monitoring instrument, completes shunting, remaining sample
Gas enters evacuated tube discharge by the second changeover portion.The branching process is coaxial sampling, and gas flow is vertical, and no turbulent flow is disturbed
Dynamic, gas enters flow only 0.098m/s before bypass duct, and 20 μm and following particulate matter are not less than in the suction efficiency of thief hatch
95%.
And due to gas sampling section height middle section flow field preferably (flowing vertically to), close to upper and lower side due to the
The influence of one changeover portion and the second changeover portion, it cannot be guaranteed that perpendicular flow well, therefore bypass duct stretches into sampling section, and prop up
The first height of bottom end of the thief hatch distance samples section of road pipe so that thief hatch is in the height middle section of sampling section.
In addition, the internal diameter of the bypass duct of the present invention is 8mm, the sample throughput of bypass duct is less than or equal to 5L/min, bypass duct
Internal diameter and flow be not arbitrarily to set as needed, but must be internal diameter 8mm, amount is less than or equal to 5L/min,
Slow flow velocity sampling could only in this way be met, and realize coaxial sampling, other situations cannot all be met the requirements.
In conclusion the present invention Atmospheric particulates sampling current divider particle sampling it is efficient (can reach 95% with
On), applicable particle size range is wide (20 μm and following particulate matter).
Preferably, the first height h above-mentioned is the half for the height for sampling section 3 so that thief hatch is in sampling section height
Between part, flow field is good.
Further, bypass duct 6 is provided with interval with 3 side of sampling section, and sampling section side can generate neighbouring flow field
It influences, the present invention avoids the too close sampling section side of bypass duct；The upper end of second changeover portion 4 is located between two bypass ducts 6, branch
The upper end-face edge of road pipe 6 and the second changeover portion 4 is provided with interval.
For convenience of processing, air inlet pipe 1 and First Transition section 2 are structure as a whole, entirely through lathe process；Sample section
3, the second changeover portion 4 and evacuated tube 5 are structure as a whole, entirely through lathe process；Sampling current divider so is just divided into
Upper and lower two parts facilitate processing and connect installation.Following form may be used in connection installation：2 lower end of First Transition section is provided with
First flange 8,3 upper end of sampling section are provided with the second flange 9, and the first flange 8 and the second flange 9 are connected by bolt 10, and first
It is provided with sealing ring between flange 8 and the second flange 9.
The installation for sampling section can be there are many form, it is preferred that the lower end of sampling section 3 is provided with branch pore, and bypass duct 6 is welded
It is connected on branch pore.
The material of the Atmospheric particulates sampling current divider of the present invention is stainless steel, and inner surface polishing treatment reduces interior table
In face of the absorption of particulate matter.
For convenience of the existing particle sampling equipment of compatibility, the internal diameter of air inlet pipe 1 is 12.7mm, and First Transition section 2 is opened
Bicker degree is preferably 90 degree, and the internal diameter of sampling section 3 is preferably 60mm, and the highly preferred of sampling section 3 is 50mm.
Bypass duct uses thin-wall tube, the thickness of bypass duct 6 to be less than or equal to 2mm, and the thief hatch resistance of thin-wall tube is less than heavy wall
Thief hatch；The axial line distance of two bypass ducts 6 is preferably 40mm；The opening angle of second changeover portion 4 is preferably 60 degree, the second mistake
The upper-end inner diameter for crossing section 4 is preferably 24mm；The internal diameter of evacuated tube 5 is preferably 8mm.
It is illustrated for 16.7L/min with sampling total flow, total sample gas of 16.7L/min enters current divider by air inlet pipe
Afterwards, flow velocity reduces, later by two bypass ducts in sampling section with the traffic sampling of 5L/min, the gas of remaining 6.7L/min
Body extracts emptying out by the evacuated tube among shunt base.Acquired particulate matter is the particle that grain size is less than or equal to 20 μm
Object, sampling section internal diameter are 60mm, and branch bore is 8mm.Calculate the sampling efficiency of each particles things of gained：Particulate matter grain
When diameter is 0.1,1,2.5,10,15,20 μm, sampling efficiency is respectively 100%, 100%, 99.9%, 98.5%, 96.9%,
95.0%, it is seen that sampling efficiency is all higher than 95%.Since branch sampling flow is bigger, sampling efficiency is lower, so the current divider
The case where to total flow be 16.7L/min, branch sampling flow is less than 5L/min is applicable in.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of Atmospheric particulates sample current divider, which is characterized in that including sequentially connected air inlet pipe from top to bottom, the first mistake
Section, sampling section, the second changeover portion and evacuated tube are crossed, wherein：
The internal diameter of the First Transition section gradually increases from top to bottom, upper-end inner diameter and the air inlet pipe of the First Transition section
Internal diameter it is identical, the bottom diameter of the First Transition section is identical as the sampling internal diameter of section；It is described sampling section internal diameter with
The value of the internal diameter of the air inlet pipe makes sample gas flow velocity after First Transition section enters sampling section be reduced to 0.098m/s；
The internal diameter of second changeover portion is gradually reduced from top to bottom, and the upper-end inner diameter of second changeover portion is less than or equal to institute
The internal diameter of sampling section is stated, the bottom diameter of second changeover portion is identical as the internal diameter of the evacuated tube；
The both sides of the evacuated tube are symmetrical arranged there are two bypass duct, and the bypass duct is put in the sampling section and the branch
Bottom end first height of the thief hatch of road pipe apart from the sampling section, the internal diameter of the bypass duct is 8mm, the sample of the bypass duct
Throughput is less than or equal to 5L/min.
2. Atmospheric particulates according to claim 1 sample current divider, which is characterized in that first height is described adopts
The half of the height of sample section.
3. Atmospheric particulates according to claim 2 sample current divider, which is characterized in that the bypass duct and the sampling
Section side is provided with interval, and the upper end of second changeover portion is located between two bypass ducts, the bypass duct and described second
The upper end-face edge of changeover portion is provided with interval.
4. Atmospheric particulates according to claim 3 sample current divider, which is characterized in that the air inlet pipe and First Transition
Section is structure as a whole；The sampling section, the second changeover portion and evacuated tube are structure as a whole；First Transition section lower end is provided with
First flange, the sampling section upper end are provided with the second flange, and first flange and the second flange are bolted, described
It is provided with sealing ring between first flange and the second flange.
5. Atmospheric particulates according to claim 4 sample current divider, which is characterized in that the lower end of the sampling section is provided with
Branch pore, the bypass duct are welded on branch pore.
6. sampling current divider according to any Atmospheric particulates of claim 1-5, which is characterized in that the Atmospheric particulates
The material for sampling current divider is stainless steel, inner surface polishing treatment.
7. Atmospheric particulates according to claim 6 sample current divider, which is characterized in that the internal diameter of the air inlet pipe is
The opening angle of 12.7mm, the First Transition section are 90 degree, and the internal diameter of the sampling section is 60mm, the height of the sampling section
For 50mm.
8. Atmospheric particulates according to claim 6 sample current divider, which is characterized in that the thickness of the bypass duct is less than
Equal to 2mm, the axial line distance of two bypass ducts is 40mm；The opening angle of second changeover portion is 60 degree, second mistake
The upper-end inner diameter for crossing section is 24mm；The internal diameter of the evacuated tube is 8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810690593.7A CN108663240B (en) | 2018-06-28 | Atmospheric particulate sampling shunt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810690593.7A CN108663240B (en) | 2018-06-28 | Atmospheric particulate sampling shunt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108663240A true CN108663240A (en) | 2018-10-16 |
| CN108663240B CN108663240B (en) | 2024-06-25 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060169064A1 (en) * | 2005-01-31 | 2006-08-03 | Anschutz Donald A | Proppant sampling |
| CN102288458A (en) * | 2011-06-30 | 2011-12-21 | 北京大学 | Multi-branch particulate matter constant-speed sampling header pipe and method for designing same |
| CN103776666A (en) * | 2014-02-17 | 2014-05-07 | 青岛众瑞智能仪器有限公司 | Six-channel air particle sampling device |
| CN104568520A (en) * | 2014-12-30 | 2015-04-29 | 青岛恒远科技发展有限公司 | Portable sampling device for pollution source dilution tunnel particles |
| CN208443618U (en) * | 2018-06-28 | 2019-01-29 | 北京市环境保护监测中心 | Atmospheric particulates sample current divider |
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060169064A1 (en) * | 2005-01-31 | 2006-08-03 | Anschutz Donald A | Proppant sampling |
| CN102288458A (en) * | 2011-06-30 | 2011-12-21 | 北京大学 | Multi-branch particulate matter constant-speed sampling header pipe and method for designing same |
| CN103776666A (en) * | 2014-02-17 | 2014-05-07 | 青岛众瑞智能仪器有限公司 | Six-channel air particle sampling device |
| CN104568520A (en) * | 2014-12-30 | 2015-04-29 | 青岛恒远科技发展有限公司 | Portable sampling device for pollution source dilution tunnel particles |
| CN208443618U (en) * | 2018-06-28 | 2019-01-29 | 北京市环境保护监测中心 | Atmospheric particulates sample current divider |
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