CN114486642A - Biological aerosol analyzer gas circuit system - Google Patents
Biological aerosol analyzer gas circuit system Download PDFInfo
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- CN114486642A CN114486642A CN202111652554.6A CN202111652554A CN114486642A CN 114486642 A CN114486642 A CN 114486642A CN 202111652554 A CN202111652554 A CN 202111652554A CN 114486642 A CN114486642 A CN 114486642A
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- flow
- pipeline
- air inlet
- gas
- outlet
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- 239000000443 aerosol Substances 0.000 title claims abstract description 38
- 239000002245 particle Substances 0.000 claims abstract description 44
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000010926 purge Methods 0.000 claims description 19
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 67
- 238000005259 measurement Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 3
- 238000000149 argon plasma sintering Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001370 static light scattering Methods 0.000 description 1
Images
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
- G01N2021/151—Gas blown
Abstract
The invention discloses a biological aerosol analyzer gas circuit system, which comprises a gas inlet pipeline, a phosgene mixing cavity (4), a gas pump (5), an outlet pipeline (11) and a particle filter (7), wherein a method of wrapping sample gas by using sheath flow in a surrounding manner is utilized, so that the sample gas flow becomes narrow, biological aerosol particles pass through a laser detection light path one by one, and the accuracy of a biological aerosol particle counter is improved; the device has the characteristics of simple structure, stable flow rate, narrow sample flow and the like, the cavity is cleaned, and the counting error is reduced.
Description
Technical Field
The invention relates to the technical field of bioaerosol analyzers, in particular to a bioaerosol analyzer gas circuit system.
Background
The bioaerosol analyzer is an apparatus for online analysis of bioaerosol by using a light scattering principle, and the principle is that laser is incident perpendicular to sample gas flow, the laser can scatter light after being emitted to the surfaces of small particles in the sample gas, and an optical sensor collects and analyzes scattered light; the scattered light of biological particles with different compositions is different, and the online strategy of the biological aerosol particles can be realized by analyzing the scattered light.
As shown in figure 1, in a common light scattering bioaerosol analyzer, sample gas flow directly enters from an air inlet (20), an air pump (5) is connected to an outlet of a phosgene mixing cavity (4), and the sample gas enters into the phosgene mixing cavity by air suction of the air pump; the air path is also connected with a pressure sensor (21) which uses the pressure to deduce the stable degree of the air pump flow. During measurement, due to the fact that sample gas flow is wide, particles are mutually adsorbed, and the like, a plurality of particles can simultaneously penetrate through a laser light path, and meter leakage and meter error can occur. And after the traditional light scattering bioaerosol analyzer is used for a period of time, a plurality of particles and dust can be settled and adsorbed in the phosgene mixing cavity and are adhered to the optical mirror surface, so that not only is an error caused in subsequent measurement, but also the measurement sensitivity is influenced.
Disclosure of Invention
In view of this, the invention provides a bioaerosol analyzer gas circuit system, which can ensure that single biological particles sequentially pass through a light path during measurement, the sample flow is narrow, the flow rate is stable, and the gas circuit system has a cleaning function, can effectively improve the precision of the bioaerosol analyzer, and reduces signal fluctuation and measurement errors.
A biological aerosol analyzer gas circuit system comprises a gas inlet pipeline, an aerosol base, a gas pump, an outlet pipeline and a particle filter;
a phosgene mixing cavity is arranged in the aerosol base;
the air inlet pipeline comprises a sample flow pipeline, a sheath flow pipeline, a sample flow air inlet nozzle, a sheath flow air inlet nozzle and an air inlet nozzle base; the air inlet nozzle base is fixedly arranged at the top of the aerosol base; the sample flow air inlet nozzle is fixedly installed at the top of the air inlet nozzle base, and the sheath flow air inlet nozzle is fixedly installed on the outer peripheral side of the air inlet nozzle base; a cavity is arranged in the air inlet nozzle base; the sample flow pipeline is communicated with the sample flow air inlet nozzle; the outlet of the sheath flow pipeline is connected with the sheath flow air inlet nozzle and is communicated with the cavity; the sample flow air inlet nozzle is provided with a central hole and a sample flow pipe communicated with the central hole; the sample flow tube is inserted into the cavity, and the outlet is positioned at the bottom of the cavity and forms a gas converging cavity; an air outlet nozzle at the bottom of the air inlet nozzle base extends into the phosgene mixing cavity;
the outlet of the aerosol base is connected with the air pump, and the outlet of the air pump is connected with the inlet of the outlet pipeline and the inlet of the sheath flow pipeline through the particle filter.
Further, the ratio of the inner diameter of the cavity of the air inlet nozzle base to the inner diameter of the sample flow pipe is 2-5.
Furthermore, the particle filter device further comprises a purging pipeline, wherein an inlet of the purging pipeline is communicated with an outlet of the particle filter, and an outlet of the purging pipeline is communicated with the phosgene mixing cavity.
Further, a first micro-flow needle valve is installed in the purging pipeline.
Further, the air pump further comprises a pressure reducing valve connected with the air pump in parallel.
Furthermore, the gas converging cavity is a conical cavity, the diameter of the top of the gas converging cavity is larger than that of the bottom of the gas converging cavity, and the inclination angle is 30-60 degrees.
Further, a first flow control valve is installed in the sheath flow pipeline; and the outlet pipeline is provided with a second flow control valve, and the flow control precision of the first flow control valve and the second flow control valve is +/-0.01L/min.
Furthermore, the air inlet pipeline also comprises a sealing ring arranged between the sample flow air inlet nozzle and the air inlet nozzle base.
Furthermore, two sheath flow air inlet nozzles which are symmetrically arranged are arranged on the periphery side of the air inlet nozzle base.
Further, a second micro-flow needle valve is arranged in the sheath flow pipeline; and a third micro-flow needle valve is arranged in the outlet pipeline.
Has the advantages that:
the biological aerosol gas circuit system has narrow sample flow, and by using the method of wrapping the sample gas by the sheath flow in a surrounding way, the sheath flows on two sides compress the sample gas flow in the middle, so that the sample gas flow becomes narrow, biological aerosol particles can be ensured to pass through a laser detection light path one by one, and the precision of a biological aerosol analyzer can be effectively improved.
The pressure reducing valve can control the pressure at the outlet of the phosgene mixing cavity to be constant, the influence of the flow of the air pump and the change of the pressure value on the air flow can be effectively reduced, the flow speed at the outlet is stable, and the signal fluctuation of the aerosol analyzer is reduced; meanwhile, two flow control valves are used in the gas circuit to control the flow entering the sheath flow pipeline and the outlet pipeline, the fluctuation is within the range of +/-0.01L/min of a set value, the flow rate is very stable, and the fluctuation of a particle counting signal is also reduced.
In the invention, the gas path system recycles a part of gas of the sheath flow back to the light-gas mixing cavity through the purging pipeline to purge particles attached to the inner wall of the cavity, thereby reducing the precipitation and adsorption of the particles in the cavity, ensuring the cleanness of the interior of the optical-mechanical system of the aerosol analyzer and reducing the error of accumulated analysis.
Drawings
Fig. 1 is a structural diagram of a gas circuit system of a conventional bioaerosol analyzer.
Fig. 2 is a structural diagram of the gas circuit system of the bioaerosol analyzer in the invention.
Fig. 3 is an exploded view of the components of the air scoop of the present invention.
FIG. 4 is a front view and a cross-sectional view of the air inlet base of the present invention.
Fig. 5 is a schematic view of the air inlet installation of the present invention.
The device comprises a sample flow pipeline 1, a sheath flow pipeline 2, a gas converging cavity 3, a phosgene mixing cavity 4, an air pump 5, a pressure reducing valve 6, a particle filter 7, a purging pipeline 8, a first flow control valve 9, a second flow control valve 10, an outlet pipeline 11, a sheath flow air inlet nozzle 12, an air inlet nozzle base 13, a sample flow air inlet nozzle 14, a sealing ring 15, an aerosol base 16, a sealing ring 17, a laser beam 18, a laser light source 19, a gas inlet 20, a pressure sensor 21, a cavity 22 and a sample flow pipe 23.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides a biological aerosol analyzer gas circuit system, which comprises a gas inlet pipeline, an aerosol base 16, a gas pump 5, an outlet pipeline 11 and a particle filter 7;
a phosgene mixing cavity 4 is arranged in the aerosol base 16;
the air inlet pipeline comprises a sample flow pipeline 1, a sheath flow pipeline 2, a sample flow air inlet nozzle 14, a sheath flow air inlet nozzle 12 and an air inlet nozzle base 13; the air inlet nozzle base 13 is fixedly arranged at the top of the aerosol base 16; the top of the air inlet nozzle base 13 is fixedly provided with a sample flow air inlet nozzle 14, and the peripheral side is fixedly provided with a sheath flow air inlet nozzle 12; a cavity 22 is arranged in the air inlet nozzle base 13; the sample flow pipeline 1 is communicated with a sample flow air inlet nozzle 14; the outlet of the sheath flow pipeline 2 is connected with the sheath flow air inlet nozzle 12 and is communicated with the cavity 22; the sample flow air inlet nozzle 14 is provided with a central hole and a sample flow pipe 23 communicated with the central hole; the sampling pipe 23 is inserted in the cavity 22, the outlet is positioned at the bottom of the cavity 22, and a gas converging cavity 3 is formed; an air outlet nozzle at the bottom of the air inlet nozzle base 13 extends into the phosgene mixing cavity 4;
an outlet of the aerosol base 16 is connected to an air pump 5, and an outlet of the air pump 5 is connected to the outlet pipeline 11 and an inlet of the sheath flow pipeline 2 through a particle filter 7.
The ratio of the inner diameter of the cavity of the air inlet nozzle base to the inner diameter of the sample flow pipe is 2-5, and according to different structures, the flow rates of corresponding sheath flow and sample flow are different, so that the particles of the air inlet can be ensured to pass through singly; if the ratio of the inner diameter of the cavity to the inner diameter of the sample flow tube is 5, the flow rate ratio of the sheath flow to the sample flow can be designed to be 3; if the ratio of the inner diameter of the cavity to the inner diameter of the sample flow tube is 2, the flow rate ratio of sheath flow to sample flow can be designed to be 5. In this embodiment, the ratio of the inner diameter of the cavity 22 to the inner diameter of the sample flow tube 23 is 2, and the flow rate ratio of the sheath flow to the sample flow is 5.
The sample gas flow with the bioaerosol particles enters from the sample flow pipeline, passes through the sample flow air inlet nozzle 14, enters the sample flow pipe, is converged with sheath flow entering the air inlet nozzle base cavity from the sheath flow air inlet nozzle in the gas converging cavity, and the converged gas is sprayed into the phosgene mixing cavity from the outlet of the gas converging cavity. The sheath flow forms conical air flow around the sample flow, and by utilizing the method that the sheath flow surrounds and wraps the sample gas, the sheath flows on two sides compress the sample gas flow in the middle, so that the sample gas flow becomes thin and narrow, biological aerosol particles can be ensured to pass through a laser detection light path one by one to generate light dispersion, and then the dispersed light can be collected and detected through other optical elements. The gas inlet pipeline enables the sample flow to be narrow, the sheath flows on the two sides compress the sample gas flow in the middle by utilizing a method of wrapping the sample gas in a surrounding mode through the sheath flows, so that the sample gas flow becomes narrow, biological aerosol particles can be guaranteed to pass through a laser detection light path one by one, and the precision of a biological aerosol analyzer can be effectively improved.
The filtration capacity of the particle filter is 0.1 μm, and particle sizes greater than 0.1 μm will not pass through the filter. After the sheath flow and the sample flow are mixed, a part of gas only has particles of 0.1 micron after passing through the particle filter and then flows back to the sheath flow pipeline, and the sheath flow has the function of compressing the sample flow. The components of the sheath flow are gases only containing aerosol below 0.1 micron, and the aerosol is particles measuring above 0.1 micron, so that the results are not interfered; less than 0.1 microns, the scattered light is weak and can be filtered out as an interference signal. After the air flow passes through the particle filter, impurity particles in the sample gas can be effectively filtered, and the sample gas enters the sheath flow air inlet nozzle to form sheath flow.
The device also comprises a purging pipeline 8, wherein the inlet of the purging pipeline 8 is communicated with the outlet of the particle filter 7, and the outlet of the purging pipeline 8 is communicated with the phosgene mixing chamber 4; a part of gas is recycled back to the optical gas mixing cavity through the purging pipeline, particles attached to the inner wall of the cavity are purged, precipitation and adsorption of the particles in the cavity are reduced, cleanness inside an optical-mechanical system of the aerosol analyzer is guaranteed, and errors of accumulated analysis are reduced.
A first micro-flow needle valve is arranged in the purging pipeline 8, and a second micro-flow needle valve is arranged in the sheath flow pipeline 2; a third micro-flow needle valve is mounted in the outlet line 11.
And a pressure reducing valve 6 connected in parallel with the air pump 5. The pressure reducing valve can control the pressure at the outlet of the phosgene mixing cavity to be constant, the influence of the flow of the air pump and the change of the pressure value on the air flow can be effectively reduced, the flow speed at the outlet is stable, and therefore the signal fluctuation of the aerosol analyzer is reduced;
the gas confluence chamber 3 is a conical chamber, the diameter of the top of the chamber is larger than that of the bottom of the chamber, and the inclination angle is 30-60 degrees.
A first flow control valve 9 is arranged in the sheath flow pipeline 2; the outlet pipe 11 is provided with a second flow control valve 10, and the flow control accuracy of the first flow control valve 9 and the second flow control valve 10 is +/-0.01L/min. Meanwhile, two flow control valves are used in the gas circuit to control the flow entering the sheath flow pipeline and the outlet pipeline, the fluctuation is within the range of +/-0.01L/min of a set value, the flow rate is very stable, and the fluctuation of a particle counting signal is also reduced.
The inlet line also includes a sealing ring 15 mounted between the sample inlet nozzle 14 and the nozzle base 13.
Two sheath flow intake nozzles 12 are mounted on the outer peripheral side of the intake nozzle base 13 in a symmetrical arrangement.
The sample flow pipeline 1 of the gas circuit system is arranged in the cavity 22 of the air inlet nozzle base 13, and the sheath flow forms conical airflow around the sample flow, so that the sample flow becomes very narrow, and the biological aerosol particles pass through a laser detection light path one by one.
The bioaerosol analyzer gas path system is shown in fig. 2, and arrows indicate the gas flow direction. And the sample gas flow with the biological aerosol particles enters the aerosol analyzer from the sample gas pipeline and is mixed with the sheath flow in the sheath flow sample flow mixing cavity.
As shown in fig. 4 and 5, in the gas merging cavity, the sheath flow forms a conical gas flow around the sample flow, the sample flow is compressed to be finer, so that the bioaerosol particles in the sample flow sequentially pass through the laser beam one by one, the light dispersion occurs, and the dispersed light is collected and detected by other optical elements. The accuracy of the bioaerosol analyzer can be effectively improved by adopting a sheath inflow port mode.
And then the gas enters the gas pump after passing through the light path, and the gas pump is connected with a pressure reducing valve in parallel, so that the pressure of the gas path can be kept stable without fluctuation.
After passing through the gas pump, the gas is passed through a particle filter capable of filtering particles having a size of more than 0.1 μm. The filtered clean gas is divided into three paths:
one path enters a purging gas path 8 and returns to the photoelectric mixing cavity 4 again to clean and purge the inside of the instrument. The flow velocity of the air flow of the purging air path is very small, and the inner cavity of the analyzer is cleaned under the condition of ensuring that the air flow in the cavity is not disturbed;
one path returns to the sheath flow pipeline 2 through the flow control valve to be used as sheath flow, the components are gas only containing 0.1 micron aerosol, the scattered light is very weak and can be filtered, and the result is not interfered.
One path enters the air outlet through the flow control valve, the high-precision flow control valve can ensure that the flow velocity of the air path is stable, and the fluctuation of the flow velocity can be controlled within the range of +/-0.01L/min of the deviation of a set value.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A biological aerosol analyzer gas circuit system is characterized by comprising a gas inlet pipeline, an aerosol base (16), a gas pump (5), an outlet pipeline (11) and a particle filter (7);
a phosgene mixing cavity (4) is arranged in the aerosol base (16);
the air inlet pipeline comprises a sample flow pipeline (1), a sheath flow pipeline (2), a sample flow air inlet nozzle (14), a sheath flow air inlet nozzle (12) and an air inlet nozzle base (13); the air inlet nozzle base (13) is fixedly arranged at the top of the aerosol base (16); the sample flow air inlet nozzle (14) is fixedly installed at the top of the air inlet nozzle base (13), and the sheath flow air inlet nozzle (12) is fixedly installed on the outer peripheral side; a cavity (22) is arranged in the air inlet nozzle base (13); the sample flow pipeline (1) is communicated with the sample flow air inlet nozzle (14); the outlet of the sheath flow pipeline (2) is connected with the sheath flow air inlet nozzle (12) and is communicated with the cavity (22); the sample flow air inlet nozzle (14) is provided with a central hole and a sample flow pipe (23) communicated with the central hole; the sample flow pipe (23) is inserted into the cavity (22), and an outlet is positioned at the bottom of the cavity (22) and forms a gas confluence cavity (3); an air outlet nozzle at the bottom of the air inlet nozzle base (13) extends into the phosgene mixing cavity (4);
the outlet of the aerosol base (16) is connected with the air pump (5), and the outlet of the air pump (5) is connected with the outlet pipeline (11) and the inlet of the sheath flow pipeline (2) through the particle filter (7).
2. The gas circuit system of claim 1, wherein the ratio of the inner diameter of the cavity (22) of the nozzle base (13) to the inner diameter of the sample flow tube (23) is 2-5.
3. The gas circuit system as claimed in claim 1, further comprising a purge line (8);
the inlet of the purging pipeline (8) is communicated with the outlet of the particle filter (7), and the outlet of the purging pipeline (8) is communicated with the phosgene mixing cavity (4).
4. A gas circuit system according to claim 3, characterized in that the purge line (8) has a first micro-flow needle valve installed therein.
5. An air circuit system according to claim 1, further comprising a pressure reducing valve (6) connected in parallel with the air pump (5).
6. The gas circuit system according to claim 1, wherein the gas merging chamber (3) is a conical chamber having a top diameter greater than a bottom diameter and an inclination angle of 30 ° to 60 °.
7. The gas circuit system according to claim 1, wherein a first flow control valve (9) is installed in the sheath flow line (2); and a second flow control valve (10) is installed on the outlet pipeline (11), and the flow control accuracy of the first flow control valve (9) and the second flow control valve (10) is +/-0.01L/min.
8. The gas circuit system of claim 1, wherein said gas inlet circuit further comprises a sealing ring (15) mounted between said sample flow inlet nozzle (14) and said nozzle base (13).
9. The air passage system according to claim 1, wherein two symmetrically arranged sheath flow air inlets (12) are installed on the outer peripheral side of the air inlet base (13).
10. The gas circuit system as claimed in claim 4, wherein a second micro-flow needle valve is installed in the sheath flow pipeline (2); and a third micro-flow needle valve is arranged in the outlet pipeline (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111652554.6A CN114486642A (en) | 2021-12-30 | 2021-12-30 | Biological aerosol analyzer gas circuit system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111652554.6A CN114486642A (en) | 2021-12-30 | 2021-12-30 | Biological aerosol analyzer gas circuit system |
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| CN114486642A true CN114486642A (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111652554.6A Pending CN114486642A (en) | 2021-12-30 | 2021-12-30 | Biological aerosol analyzer gas circuit system |
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| CN (1) | CN114486642A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116275536A (en) * | 2023-03-16 | 2023-06-23 | 中船重工安谱（湖北）仪器有限公司 | Chip silk screen removing device and method |
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