CN209102472U - Big flow can the multistage PM2.5 isokinetic sampling's device assembled - Google Patents
Big flow can the multistage PM2.5 isokinetic sampling's device assembled Download PDFInfo
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- CN209102472U CN209102472U CN201821946699.0U CN201821946699U CN209102472U CN 209102472 U CN209102472 U CN 209102472U CN 201821946699 U CN201821946699 U CN 201821946699U CN 209102472 U CN209102472 U CN 209102472U
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- isokinetic sampling
- connecting tube
- sampling
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Abstract
The utility model discloses a kind of big flow can multistage assembling PM2.5 isokinetic sampling's device, it is responsible for including several sections, being responsible for tail portion can the removable connection between adjacent supervisor, diffluence pass is provided on every section supervisor, diffluence pass is used for external monitoring instrument, supervisor head is provided with isokinetic sampling's head, isokinetic sampling's head and the concentric setting of supervisor, isokinetic sampling's head passes through in the first connecting tube setting supervisor, it protrudes at the top of first connecting tube in isokinetic sampling's head and seals therewith, the bottom outer wall and supervisor's inner wall sealing of first connecting tube, enter isokinetic sampling's head into the gas part of supervisor, another part enters diffluence pass；Supervisor is located at the first connecting tube section below and is provided with gas flaring channel, and flaring channel is connected to the entrance of next section supervisor.Coaxial constant-speed sampling can reduce sampling of aerosol loss to the greatest extent, to guarantee that particle components are identical as particle components in next stage supervisor in the gas of sample diffluence pass, increase the authenticity of sample.
Description
Technical field
The present invention relates to atmosphere environment supervision fields, and in particular to the big flow that one kind can reduce sampling of aerosol loss can
PM2.5 isokinetic sampling's device of multistage assembling.
Background technique
With the development of modern industry and transportation, people's particulate matter of continued emissions into atmosphere is more and more,
The phenomenon that causing atmosphere pollution is increasingly severe, research shows that aerosol can reduce visibility, influences rainfall distribution, raw to the mankind
The harm of dis environment has increasingly sharpened, and the air of long-term sucking pollution can also cause chronic bronchitis, bronchial asthma, lung
Many diseases such as cancer.
Aerosol is got more and more attention at present, and the particle components of aerosol, to carry out the problems such as source distribution be current
The research hotspot of atmospheric aerosol, and the analysis of the different characteristics of aerosol usually requires the more instruments while work of different principle
Make.Common sampling general pipeline, can be inconsistent due to each instrument flow so that turbulent flow, collider between particle occur for air-flow in general pipeline
Rate increases, and is unable to ensure the authenticity of sample, general pipeline flexibility is lower, poor to the applicability of different instruments.
Summary of the invention
The technical problem to be solved by the present invention is in existing sampling general pipeline gas occur turbulent flow, particle encounter loss to
The problem of influencing sample authenticity.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows: a kind of big flow can multistage assembling
PM2.5 isokinetic sampling's device, including several sections supervisor, supervisor tail portion can the removable connection between adjacent supervisor, every section supervisor
On be provided with a diffluence pass, diffluence pass is used for external monitoring instrument, and supervisor head is provided with isokinetic sampling's head, constant speed
Sampling head and the concentric setting of supervisor, isokinetic sampling's head at the top of the first connecting tube by stretching in the first connecting tube setting supervisor
Enter in isokinetic sampling's head and seals therewith, the bottom outer wall and supervisor's inner wall sealing of the first connecting tube, into the gas of supervisor
Part enters isokinetic sampling's head, and another part enters diffluence pass；Supervisor is located at the first connecting tube section below and is provided with gas gradually
Expand channel, flaring channel is connected to the entrance of next section supervisor.
Further, it is equipped with annular groove on the inside of the top and bottom of supervisor, sealing ring, adjacent supervisor are set in groove
Head and tail inner side be provided with perforation two supervisor the second connecting tubes, the second connecting tube and supervisor inner wall and sealing ring it
Between tight fit.
Further, tapered at the gas access of isokinetic sampling head, and bottom is provided with columnar notch, first
Connecting tube protrudes into column notch and its end face and the end face of column notch offset, in the first connecting tube or isokinetic sampling's head
It is also provided with annular groove, sealing ring is being set in annular groove for sealing between the first connection pipe outer wall and isokinetic sampling's head
Gap；Inlet radius flow set according to needed for the diffluence pass of corresponding supervisor of isokinetic sampling's head.
Further, the gas flaring channel of supervisor is in isosceles trapezoid by any section of axial line, and this is trapezoidal
Waist and the angle of axial line be 6~7.5 °.
From above-mentioned technical proposal it can be seen that the invention has the following advantages that charge air flow direction is vertical in the present invention, and
Laminar flow is kept before into sampling head, effectively prevents sampling loss, while sampling process is reduced using thin-walled isokinetic sampling head
In influence of the possible small turbulent flow to sampling efficiency, to guarantee particle components and next stage master in the gas of sample diffluence pass
Particle components are identical in pipe, increase the authenticity of sample.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
It is the coefficient of partial resistance of diffuser and the relation curve for expanding gradually angle that Fig. 2, which is in the present invention,；
Fig. 3 is flaring angle and local losses relation curve；
Fig. 4 is flaring angle and pipe range relation curve.
Specific embodiment
A specific embodiment of the invention is illustrated below in conjunction with attached drawing.
As shown in Figure 1, big flow of the invention can multistage assembling PM2.5 isokinetic sampling's device, including several sections supervisor
2, supervisor's joint number selects according to actual needs, and in present embodiment by taking two sections supervisor as an example, supervisor tail portion can be with adjacent supervisor's
Between removable connection, the inlet of head section supervisor is provided with the pipeline of long 30cm.It is provided with a diffluence pass 8 on every section supervisor,
Diffluence pass 8 is used for external monitoring instrument, supervisor head is provided with isokinetic sampling's head 6, isokinetic sampling's head 6 and supervisor 2 are same
Axle center setting, isokinetic sampling's head 6 are set in supervisor 2 by the first connecting tube 7, and the top of the first connecting tube 7 is protruded into constant speed and adopted
It seals in sample head 6 and therewith, the bottom outer wall and supervisor's 2 inner walls sealing of the first connecting tube 7, into the gas part of supervisor 2
Into isokinetic sampling's head 6, another part enters diffluence pass 8；Supervisor 2 is located at the first connecting tube section below and is provided with gas flaring
Channel 4, flaring channel 4 are connected to the entrance of next section supervisor.
Be equipped with annular groove 5 on the inside of the top and bottom of supervisor 2, sealing ring be set in groove, adjacent supervisor head and
Tail inner side is provided with the second connecting tube 3 of two supervisors of perforation, tight between the second connecting tube 3 and supervisor's inner wall and sealing ring
Cooperation, is connected the two using the second connecting tube.To realize multistage fixation.
It is tapered at the gas access of isokinetic sampling's head 6, and bottom is provided with columnar notch, the first connecting tube is stretched
Enter in column notch and its end face and the end face of column notch offset, is also provided in the first connecting tube 7 or isokinetic sampling's head
Sealing ring is being arranged for sealing the gap between the first connection pipe outer wall and isokinetic sampling's head in annular groove in annular groove.
Inlet radius flow set according to needed for the diffluence pass of corresponding supervisor of isokinetic sampling's head.Isokinetic sampling's head flow velocity Vx=
qx/sx, corresponding gas flow rate Vx=Q in the same horizontal position general pipelinex-1/ S, wherein qxFor the sampling flow (root of isokinetic sampling's head
Depending on instrument flow), sxFor isokinetic sampling's head thief hatch inner section product, Qx-1For corresponding discharge in the same horizontal position general pipeline,
S is general pipeline inner section product.Isokinetic sampling's head thief hatch inner section product sxIt is equal to the ratio between isokinetic sampling's device inner section product S
Flow q at isokinetic sampling's head thief hatchxWith the same horizontal position device total flow Qx-1The ratio between.Therefore it can determine isokinetic sampling
Head specification.The device strong flexibility detachably can be suitable for the integrated sampling of different instrument quantities by adjusting supervisor's joint number.
It is suitable for the different instrument of flow by adjusting isokinetic sampling's head specification.
Enter gas flaring channel 4 after the first connecting tube into the gas after isokinetic sampling's head.If pipe diameter is prominent
So expansion, fluid abruptly enters big pipeline by small pipeline, and due to effect of inertia, fluid particle can not be at unexpected expansion at once
It is attached at wall surface, it may appear that a series of vortex not only has lost the mechanical energy of air-flow, be also easy to when acquiring aerosol at this time
Cause the disorder of particulate, occur particle touch simultaneously, the interactions such as separation influence aerosol shape.On the other hand, gas
Flow velocity is necessarily redistributed when entering big pipe from tubule, is increased the relative motion of gas, is led to gas and contained and aerosol
It is further to hit friction.To can all have local losses in very long a distance of disappearance since vortex.
We should make as far as possible air-flow held stationary in general pipeline design process and pipeline is not easy too long, can use local resistance
Power loss selects optimal flaring angle (to refer to and appoint by the axial line in flaring channel as the foundation for measuring sampling pipe air flow condition
The waist for the isosceles trapezoid that one section is formed and the angle of axial line, the also referred to as angle of flare) local resistance is effectively reduced, avoid because
Generating vortex influences the form of sampling particle.Fig. 2 is that the coefficient of partial resistance of diffuser and the relationship for expanding gradually angle are bent in the present invention
Line.By Fig. 2 it is found that for certain caliber ratio, when 2.5 ° < θ < 7.5 °, coefficient of partial resistance is minimum.But work as angle of flare
When degree is less than 2.5 °, divergent segment is too long, it is larger to will lead to frictional resistance, and longer pipeline need to occupy very large space, to gas
Colloidal sol samples extremely inconvenient for general pipeline.Angle, which is greater than 7.5 °, can cause gas wall flow separation, shape poor so as to cause pressure recovery
At vortex.
Aerosol can pass through after PM2.5 isokinetic sampling's head of multistage assembling by flaring by big flow in this sampling general pipeline design
Pipe enters next stage sampling, diffuser inlet diameter d in the present embodiment1=8mm, outlet diameter d2=31mm, works as flow
When 25.3L/min, the different calculated local losses (h of flaring angle θj) as shown in figure 3, when flaring angle is less than 8 °, pipeline
Local losses variation is more steady, and local losses is smaller, and air-flow is also relatively stable.
Fig. 4 is the relationship at flaring angle and flaring passage length, when angle is greater than 6 °, can substantially reduce pipe range, preferably
When being 7 °.To sum up, the angle at the flaring angle should be greater than 6 ° less than 7.5 °, and preferably 7 °.
In addition, entirely sampling inside pipe wall is polished, make its inner wall smooth, reduces the friction in aerosol transmission process
Resistance avoids particulate matter from being attached on inside pipeline and causes pipeline blockage and particle loss.Supervisor's external wall cross-section product is designed to
Regular hexagon, appearance is more beautiful, and outer wall is made to have plane, convenient for being fixed by screws on rack or wall.
Claims (4)
1. a kind of big flow can multistage assembling PM2.5 isokinetic sampling's device, it is characterised in that: be responsible for including several sections, supervisor
Tail portion can the removable connection between adjacent supervisor, is provided with a diffluence pass on every section supervisor, diffluence pass is used for external monitoring
Instrument is provided with isokinetic sampling's head on supervisor head, and isokinetic sampling's head passes through with concentric setting, isokinetic sampling's head is responsible for
In first connecting tube setting supervisor, protrudes into isokinetic sampling's head and seal therewith, the first connecting tube at the top of the first connecting tube
Bottom outer wall and supervisor inner wall sealing, enter isokinetic sampling's head into the gas part of supervisor, another part enters diffluence pass；
Supervisor is located at the first connecting tube section below and is provided with gas flaring channel, and gas flaring channel is connected to entering for next section supervisor
Mouthful.
2. big flow according to claim 1 can multistage assembling PM2.5 isokinetic sampling's device, it is characterised in that: supervisor
Top and bottom on the inside of be equipped with annular groove, sealing ring is set in groove, adjacent supervisor head and tail inner side are provided with
Penetrate through the second connecting tube of two supervisors, tight fit between the second connecting tube and supervisor's inner wall and sealing ring.
3. big flow according to claim 2 can multistage assembling PM2.5 isokinetic sampling's device, it is characterised in that: it is described
It is tapered at the gas access of isokinetic sampling's head, and bottom is provided with columnar notch, the first connecting tube protrudes into column notch
And its end face and the end face of column notch offset, column, are also provided with annular groove in the first connecting tube or isokinetic sampling's head,
Sealing ring is being set in annular groove for sealing the gap between the first connection pipe outer wall and isokinetic sampling's head；The constant speed is adopted
The inlet radius of sample head flow set according to needed for the diffluence pass of corresponding supervisor.
4. big flow according to claim 1 can multistage assembling PM2.5 isokinetic sampling's device, it is characterised in that: supervisor
Gas flaring channel by any section of axial line be in isosceles trapezoid, and the angle of the trapezoidal waist and axial line is 6
~7.5 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821946699.0U CN209102472U (en) | 2018-11-23 | 2018-11-23 | Big flow can the multistage PM2.5 isokinetic sampling's device assembled |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821946699.0U CN209102472U (en) | 2018-11-23 | 2018-11-23 | Big flow can the multistage PM2.5 isokinetic sampling's device assembled |
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| CN209102472U true CN209102472U (en) | 2019-07-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632398A (en) * | 2018-11-23 | 2019-04-16 | 北京大学深圳研究生院 | Big flow can the multistage PM2.5 isokinetic sampling's head assembled |
| CN111829840A (en) * | 2020-08-20 | 2020-10-27 | 赵姝萌 | Flow-dividing atmospheric sampling device with screw device |
-
2018
- 2018-11-23 CN CN201821946699.0U patent/CN209102472U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632398A (en) * | 2018-11-23 | 2019-04-16 | 北京大学深圳研究生院 | Big flow can the multistage PM2.5 isokinetic sampling's head assembled |
| CN111829840A (en) * | 2020-08-20 | 2020-10-27 | 赵姝萌 | Flow-dividing atmospheric sampling device with screw device |
| CN111829840B (en) * | 2020-08-20 | 2024-04-30 | 赵姝萌 | Split-flow atmospheric sampling device with screw device |
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