CN210638974U - Aerosol sampling analyzer and aerosol analysis system - Google Patents
Aerosol sampling analyzer and aerosol analysis system Download PDFInfo
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- CN210638974U CN210638974U CN201921473231.9U CN201921473231U CN210638974U CN 210638974 U CN210638974 U CN 210638974U CN 201921473231 U CN201921473231 U CN 201921473231U CN 210638974 U CN210638974 U CN 210638974U
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Abstract
The utility model provides an online sampling injector of aerosol adopts the scheme that sampling enrichment and thermal analysis combine together, and sampling and analysis go on in step, have realized quick online high-efficient sampling, enrichment and the analysis of aerosol sample. Simultaneously can expand sampling enrichment unit and thermal analysis unit according to the demand and can realize multiple spot sampling or multichannel sampling analysis function, the sampling piece is convenient for change and is favorable to the later maintenance. The device is used for detecting the aerosol sample by the ion mobility spectrometry, so that the sensitivity is greatly improved.
Description
Technical Field
The utility model relates to an online sampling of aerosol, absorption, enrichment and thermal analysis technical field, concretely relates to aerosol particulate matter sampling and analytical equipment, and its application at ion mobility spectrometry.
Background
An aerosol (aerosol) is a colloidal dispersion system, the dispersed phase of which is a small solid or liquid particle and the dispersion medium is a gas. Liquid aerosols are commonly referred to as mists, and solid aerosols are commonly referred to as mists.
The aerosol has great application in the aspects of medicine, environmental science, military science and the like. Is applied to the preparation of dust type medicines for treating respiratory diseases in the medical aspect. Environmental science aspects such as satellite detection of fires, remote sensing of sandstorms, etc. In military applications such as smoke bombs, aerosol smoke can also be produced to combat laser weapons.
There are generally three methods for collecting aerosols: filter collector, impingement collector, and deposition collector. Because the content of aerosol in the atmosphere is very low, a large-flow sampler is usually adopted to collect samples, an impact collector is convenient for analyzing the particle size distribution of aerosol organic samples, and organic matters are collected on an absorbing substance such as aluminum foil on the impact collector.
The chemical substances in the atmospheric aerosol are complex and have extremely low content, and the selection of a proper analysis method is particularly important. The best solution is found by specific analysis of different samples and different analysis objects. At present, the aerosol sample is firstly collected, then is subjected to pretreatment of several steps such as extraction, separation and concentration, and then is subjected to qualitative and quantitative analysis by using instruments such as gas chromatography, mass spectrometry, infrared spectroscopy and the like. This process is extremely complex, time consuming and does not allow for rapid on-line collection and analysis of aerosol samples.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the not enough of existence among the prior art, provide an online sampling device of aerosol, solved the quick online high-efficient collection of aerosol sample, enrichment and analysis emphatically. On the premise of ensuring the detection sensitivity, the sampling analysis time is shortened; on the premise of ensuring the total analysis time, increasing the enrichment time of the sample; meanwhile, the complexity and the volume/weight of the sample injector are reduced, the cost is reduced, and the miniaturization and the integration are realized.
The utility model adopts the technical scheme that:
an aerosol sampling analyzer comprises a sampling enrichment unit, a thermal analysis unit and a transmission unit; the sampling enrichment unit comprises a sampling port; the thermal analysis unit comprises a thermal analysis assembly and an analysis port; the transfer unit comprises a transfer plate and at least one adsorption sheet; any two parts of the transmission plate are respectively positioned at the sampling port and the analysis port; the two parts are respectively provided with a through hole which is matched with the sampling port and the analysis port; the adsorption sheet is covered on at least one through hole, and the position of the adsorption sheet can be switched between the two local parts; the periphery of the adsorption sheet is provided with air holes which are uniformly distributed.
Preferably, the aerosol sampling analyzer further comprises a driving device I, and the driving device I is used for driving the adsorption sheet to move on the transmission plate, so that the adsorption sheet is switched between two local positions.
The utility model also provides another aerosol sampling analyzer, which comprises a sampling enrichment unit, a thermal analysis unit and a transmission unit; the sampling enrichment unit comprises a sampling port; the thermal analysis unit comprises a thermal analysis assembly and an analysis port; the transfer unit comprises a transfer plate and at least one adsorption sheet; the transmission plate has at least two free ends; the two free ends are respectively provided with a through hole which is matched with the sampling port and the analysis port; the adsorption sheet is covered on at least one through hole; the periphery of the adsorption sheet is provided with air holes which are uniformly distributed; the transmission plate can realize the position conversion of the two free ends at the sampling port and the analysis port by rotating, thereby driving the position conversion of the adsorption sheet at the sampling port and the analysis port.
Preferably, the aerosol sampling analyzer further comprises a driving device I, and the driving device I is used for driving the transmission plate to rotate, so as to drive the free end and the adsorption sheet to realize the conversion between the sampling port and the analysis port.
Preferably, the peripheral side of the adsorption sheet is fixed to the outer periphery of the through-hole.
Preferably, the thermal desorption unit further comprises a gas chamber communicated with the desorption port; the air chamber is provided with an air inlet pipe and an air outlet pipe which are communicated; the thermal analysis assembly of the thermal analysis unit comprises a heating rod and a temperature sensor which are matched with the gas chamber.
Preferably, the sampling enrichment unit further comprises a sampling air passage and an air pumping device, and the sampling port is positioned between the sampling air passage and the air pumping device; the air suction device can move along the axial direction of the sampling air passage.
Preferably the thermal analysis unit further comprises a support, the resolving port being located between the thermal analysis assembly and the support.
Preferably, the thermal analysis unit further comprises a driving device II, and the driving device II can drive the supporting piece to move so as to realize that the adsorption sheet is sealed between the air chamber of the thermal analysis assembly and the supporting piece.
The invention also provides an aerosol analysis system which combines the aerosol sampling analyzer with the ion mobility spectrometry.
The transfer unit preferably comprises a transfer plate, an adsorption sheet and a drive means I (preferably a radial rotary drive means). The transmission plate is preferably a symmetrical rectangular flat plate, a fixing hole is preferably arranged in the center of the transmission plate, the transmission plate is fixed on a rotating shaft of a driving device I (preferably a radial rotation driving device) through the fixing hole, and two through holes (preferably circular) which are symmetrical in the center are preferably arranged on the transmission plate and can be respectively matched with the sampling port and the analysis port. Two adsorption sheets (preferably circular) are respectively covered on the two through holes, and a group of air holes which are uniformly distributed are arranged at the edge of the adsorption sheet and are used for ventilation.
The adsorption sheet is made of high-temperature-resistant fabric or paper material, and is more preferably high-temperature-resistant cloth; the high temperature resistance means the temperature resistance of 200-250 ℃.
The thermal analysis unit is used for gasifying the collected aerosol sample at high temperature and sending the gas into the detection unit, and comprises a thermal analysis assembly, a support piece and a driving device II (preferably an axial displacement driving device). One end of the thermal resolution component is provided with a groove to form an air chamber. The support is interposed between the driving means II and the thermal desorption assembly. The driving device II can be a stepping motor or an electromagnetic valve and the like.
The transmission plate preferably has three or four free ends.
The transmission plate can be in a three-diamond or cross-shaped centrosymmetric shape, the sampling enrichment unit and the thermal analysis unit are synchronously added, and 2-point sampling can be realized if the transmission plate is in a three-diamond shape; if the cross-shaped sample is adopted, 3-point sampling or 2-path sampling analysis can be realized.
The adsorption sheet is made of an adsorption material and can be in a shape of a net-shaped wafer or a wafer with vent holes uniformly distributed on the edge. The adsorption sheet and the transmission plate can be fixedly sealed by gluing or clamping.
Need in the aspect of high sensitivity, quick sampling analysis for satisfying present gas solution sampling appearance, the utility model discloses combine the principle of striking collector, combine together with thermal analysis analyzer, design an online sampling appearance ware device of aerosol, realized the online quick collection of aerosol to send the sample of gathering into rapid analysis in the ion mobility spectrometry through thermal analysis ware. Meanwhile, multi-point sample collection or multi-path sample analysis can be realized by expanding the collection and enrichment unit or the thermal analysis unit. The sampling injector can improve the sensitivity and shorten the sampling analysis time.
The utility model has the advantages that:
(1) the scheme of combining sampling enrichment with thermal analysis is more favorable for realizing real-time online sampling and detection, and compared with the traditional independent scheme of sampling, analyzing and separating, the scheme can reduce the loss of samples in the transmission process and is favorable for improving the sensitivity.
(2) Under the condition of strict requirements on sampling and analysis timeliness, synchronous sampling and analysis can be realized, the sampling enrichment unit also starts sampling when a sample is analyzed, and the analysis time is fully utilized. If the analysis time is fixed, the sampling and analysis time is shortened under the condition that the sampling time is not changed; under the condition that the total analysis and sampling time are not changed, the sampling enrichment time is prolonged, and the sensitivity is favorably improved.
(3) The sampling enrichment unit and the thermal analysis unit can be expanded according to requirements, and the multi-point sampling or multi-path sampling analysis function can be realized.
(4) The sampling piece is convenient to change, is favorable to later maintenance such as injector pollution.
(5) The sampling sheet can be made of various adsorption materials, and the adsorption sampling sheet made of different materials can be replaced according to different samples.
(6) The thermal analysis unit can adjust the temperature according to the sample, and can work at constant temperature or realize flash heat work in an energy-saving mode.
(7) The structure is reasonable and compact, the miniaturization is convenient, and the installation and adjustment are facilitated.
On ion mobility spectrometry, the device is used to detect aerosol samples, compared to other aerosol sampling injectors, such as: the membrane enrichment sampling and sampling device has the advantages that the whole sampling and analyzing period is greatly shortened, the sensitivity is greatly improved, the anti-interference capability is enhanced, and the signal influence of other impurities on the instrument is reduced.
Drawings
The invention will be described in further detail with reference to the accompanying drawings:
fig. 1 is a schematic structural diagram of an aerosol online sampling injector.
Fig. 2 is a schematic diagram of the structure of a transmission plate and a sampling sheet of the transmission unit.
Fig. 3 is a schematic diagram of the principle of an aerosol on-line sampling injector with 2-point sampling expansion.
Fig. 4 is a schematic diagram of the principle of an aerosol on-line sampling injector expanded into 2-way sampling analysis.
FIG. 5 shows an ion mobility spectrometry contrast spectrum of aerosol samples of different sample amounts detected by the device (right) and the membrane enrichment sampling injector (left);
in the figure, 1 is a thermal desorption assembly; 2. 18, 26 transmission plates; 3 an adsorption sheet; 4 driving device II; 5 a support member; 6, a driving device I; 7, an air extracting device; 8, sampling an air passage; 9 air holes; 10 through holes; 11 air chamber; 12 air inlet pipes; 13, an air outlet pipe; 14 heating a rod; 15 a temperature sensor; 16 rotating shafts; 17 a fixing hole; 19 a first sample enrichment unit; 20 a second sampling enrichment unit; 21 a first thermal analysis unit; 22 sampling and enriching units; 23 one-path thermal desorption unit; 24 two-way sampling enrichment unit; 25 two-way thermal analysis unit.
Detailed Description
The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
Example 1
The utility model provides an aerosol sampling resolver, as shown in figure 1, including sampling enrichment unit, thermal analysis unit, transmission unit.
The sampling and enriching unit is used for collecting, adsorbing and enriching an aerosol sample to be detected and comprises a sampling air passage 8, a sampling port and an air extractor 7. The sampling air passage 8 is preferably a large-caliber cylindrical structure, one end of the sampling air passage is an aerosol sample inlet, the other end of the sampling air passage is a sampling port, and the other side of the sampling port, which is opposite to the sampling air passage 8, is provided with an air extraction device 7, preferably any large-flow equipment for realizing air flow, such as an air pump or a fan. The air exhaust device 7 can move along the axial direction of the sampling air passage 8, the air passage of the sampling enrichment unit is sealed, and the adsorption sheet 3 on the transmission plate 2 can be sealed between the air exhaust device and the sampling air passage.
The thermal desorption unit is used for gasifying the collected aerosol sample at high temperature and sending the gas into an external analytical instrument, and comprises a thermal desorption port, a desorption assembly 1, a support piece 5 and a driving device II 4. One end of the thermal analysis assembly is provided with a groove to form an air chamber 11, the air chamber 11 is communicated with the analysis port, the support piece 5 is positioned between the driving device II and the analysis port, and the support piece 5 can move up and down under the driving of the driving device II 4, so that the air chamber 11 can be sealed. The thermal analysis assembly 1 is further provided with an air inlet pipe 12, an air outlet pipe 13, a heating rod 14 and a temperature sensor 15. The air inlet pipe 12 vertically penetrates through the thermal analysis assembly 1 and is communicated with the air chamber 11, and an air outlet pipe 13 is arranged on one horizontal side of the thermal analysis assembly 1 and penetrates through the thermal analysis assembly 1 and is also communicated with the air chamber 11. The heating rod 14 and the temperature sensor 15 can realize the constant temperature or flash heat function of the thermal analysis 1 assembly 1, and the detection range of the sample is enlarged.
The transmission unit comprises a transmission plate 2, an adsorption piece 3 and a driving device I6 (a rotary motor), wherein the transmission plate 2 can realize the rotary reciprocating transmission of the adsorption piece 3. When the adsorption piece is two pieces, the transmission unit is used for transmitting the adsorption piece which is enriched with the aerosol sample from the sampling port of the sampling enrichment unit to the analysis port of the thermal analysis unit, and simultaneously transmitting the other adsorption piece which is analyzed and has no sample back from the analysis port of the thermal analysis unit to the sampling port of the sampling enrichment unit. In a specific one of the ways, the material is,
as shown in fig. 2, the transmission plate 2 is a generally rectangular plate with a central symmetry, and a fixing hole 17 is formed at the center of the transmission plate 2, through which a rotating shaft 16 for fixing the transmission plate 2 to the driving device I6 is fixed, and the rotating shaft 16 drives the transmission plate 2 to rotate together when rotating. Two ends of the transmission plate 2 are respectively provided with a centrosymmetric circular through hole 10 for gas circulation, and the two circular through holes 10 can be respectively coaxial with the analysis port and the sampling port. The adsorption sheet 3 is usually a circular adsorption sheet, the edge of the adsorption sheet is provided with a group of uniformly distributed air holes 9, the two circular adsorption sheets 3 cover the two circular through holes, and the edge of the adsorption sheet 3 is provided with a group of uniformly distributed circular air holes 9 for ventilation. The two adsorption sheets 3 are concentrically glued or clamped on the periphery of the circular through hole 10 and are driven by the driving device I6 to rotate freely by taking the rotating shaft 16 as the center.
The working mode of the sampling enrichment unit is as follows: the sample-free adsorption sheet 3 of the transmission unit is rotated downwards by the rotating motor 6 to a sampling port between the sampling air channel 8 and the air extracting device 7, the adsorption sheet 3 is coaxial with the sampling port, and the air extracting device 7 moves upwards to seal the transmission plate 2 and the adsorption sheet 3 between the sampling air channel 8 and the air extracting device 7 to form a closed air channel. At this time, the air extractor 7 is started, and the aerosol sample is driven by the air flow to impact the adsorption sheet 3 along the sampling air passage 8, and is adsorbed, enriched and collected. The redundant gas passes through the air holes 9, the through holes 10 and the air extractor 7 on the adsorption sheet 3 in sequence to be discharged. And after the collection is carried out for a certain time, the sampling enrichment process is finished, and the sampling is finished.
The working process of the thermal analysis unit is as follows: the adsorption piece 3 with the sample of the transmission unit is rotated downwards to an analysis port by the rotation of the driving device I6, namely the adsorption piece 3, the thermal analysis component and the supporting piece 5 are coaxial; the driving device I4 moves the supporting piece 5 upwards, seals the adsorption sheet 3 on the air chamber 11, heats the sample supporting piece, the carrier gas flow flows through the air inlet pipe 12 to reach the air chamber 11, and brings out the gasified sample from the air outlet pipe 13 to be sent into an analytical instrument, such as an ion mobility spectrometry. And after a certain time of analysis, finishing the sample injection analysis process and finishing sample injection.
The whole working process of the sample injector is as follows: firstly, collecting an aerosol sample on the adsorption sheet 3, sending the adsorption sheet 3 to a thermal analysis unit by the transmission unit after sampling, analyzing the sample, and sending the adsorption sheet 3 without the sample, which is analyzed last time, to a sampling unit for sampling. The sampling and analyzing processes may be performed simultaneously. The time is saved, and the sampling analysis process is accelerated.
Example 2
As shown in fig. 3, if multi-point sampling is to be implemented, the transmission plate 18 may be made into a three-diamond shape with three free ends, and two end points are respectively provided with a sampling enrichment unit, such as a first sampling enrichment unit 19 and a second sampling enrichment unit 20, and the other end point is provided with a first thermal analysis unit 21 shared by the two units, so as to implement different point sample collection and analysis.
The working process is as follows: assuming that the first sampling and enriching unit 19 starts sampling at this moment, the first thermal analysis unit 21 is analyzing the sample of the second sampling and enriching unit 20, and after a certain time, the sampling and analyzing processes are both finished, the transmission unit rotates the transmission plate 18 by 120 degrees, and sends the sample into the first thermal analysis unit 21 to start analyzing the sample of the first sampling and enriching unit 19, and the second sampling and enriching unit 20 starts sampling at the same time. After a certain time, the sampling and analyzing process is finished, the transmission unit rotates the transmission plate 18 by 240 degrees, the sample is sent to the first thermal analysis unit 21, the sample of the second sampling and enriching unit 20 starts to be analyzed, and the first sampling and enriching unit 19 starts to sample. The whole process is circulated continuously, and sampling of different sampling points is achieved.
Example 3
If the transfer plate 26 is formed in a cross shape having four free ends, as shown in fig. 4, the sampling concentration unit and the thermal analysis unit are installed at four ends at intervals, so that the collection and analysis of multiple samples can be performed.
The working process is as follows: assuming that one sampling enrichment unit 22 starts sampling at this moment, and one thermal analysis unit 23 is analyzing one sample; the two-way sampling and enriching unit 24 starts sampling, and the two-way thermal analysis unit 25 analyzes a way of sample; after a certain time, the sampling and analyzing processes are finished, the transmission unit rotates the transmission plate 26 by 90 degrees, one path of sample is sent to the thermal analysis unit 23 to start analysis, one path of sample enrichment unit 22 starts sampling the sample, meanwhile, two paths of samples are sent to the thermal analysis unit 24 to start analysis, and two paths of sample enrichment units 25 start sampling the sample. The whole process is circulated continuously, and sampling analysis of different multipath samples is realized.
Test examples and comparative examples
The same ion mobility spectrometry of figure 5 is changed different sampling injector and is detected different sample volume aerosol sample, and the right picture is for utilizing the utility model discloses aerosol sampling analyzer detects, and the left picture is for utilizing traditional membrane enrichment sampling injector to detect. The ion mobility spectrum of the sample injector is utilized, the signal is greatly increased along with the increase of the sample amount, and the signal intensity is about 142mV when the sample amount is 5 ng. The signal intensity detected by the membrane enrichment sample injector sample amount of 50ng and 100ng is basically unchanged, and no signal exists at 5 ng. Both compare, utilize the utility model discloses the device detects about 7 times than traditional device and has improved on the aerosol sample signal strength, and sensitivity has improved, detects the limit and has lower, is less than 5 ng.
The device for realizing multipoint or multipath sampling analysis is also applicable to the application by referring to the sampling enrichment unit or the thermal analysis unit array of the transmission units in other shapes in the design thought.
Claims (10)
1. The aerosol sampling analyzer is characterized by comprising a sampling enrichment unit, a thermal analysis unit and a transmission unit; the sampling enrichment unit comprises a sampling port;
the thermal analysis unit comprises a thermal analysis assembly and an analysis port; the transfer unit comprises a transfer plate and at least one adsorption sheet; any two parts of the transmission plate are respectively positioned at the sampling port and the analysis port; the two parts are respectively provided with a through hole which is matched with the sampling port and the analysis port; the adsorption sheet is covered on at least one through hole, and the position of the adsorption sheet can be switched between the two local parts; the periphery of the adsorption sheet is provided with air holes which are uniformly distributed.
2. The aerosol sampling parser according to claim 1, further comprising a driving device I, wherein the driving device I is configured to drive the adsorption sheet to move on the transmission plate, so as to switch the position of the adsorption sheet between two local positions.
3. The aerosol sampling analyzer is characterized by comprising a sampling enrichment unit, a thermal analysis unit and a transmission unit; the sampling enrichment unit comprises a sampling port;
the thermal analysis unit comprises a thermal analysis assembly and an analysis port;
the transfer unit comprises a transfer plate and at least one adsorption sheet; the transmission plate has at least two free ends; the two free ends are respectively provided with a through hole which is matched with the sampling port and the analysis port; the adsorption sheet is covered on at least one through hole; the periphery of the adsorption sheet is provided with air holes which are uniformly distributed;
the transmission plate can realize the position conversion of the two free ends at the sampling port and the analysis port by rotating, thereby driving the position conversion of the adsorption sheet at the sampling port and the analysis port.
4. The aerosol sampling resolver according to claim 3, further comprising a driving device I, wherein the driving device I is configured to drive the transmission plate to rotate, so as to drive the free end and the absorption sheet to realize the switching between the sampling port and the analysis port.
5. An aerosol sampling resolver according to claim 3, wherein the peripheral side of the sheet is fixed to the outer periphery of the through hole.
6. An aerosol sample analyzer according to any of claims 1-5 wherein the thermal analysis unit further comprises a gas chamber in communication with the analysis port; the air chamber is provided with an air inlet pipe and an air outlet pipe which are communicated; the thermal analysis assembly of the thermal analysis unit comprises a heating rod and a temperature sensor which are matched with the gas chamber.
7. The aerosol sample analyzer as claimed in any one of claims 1 to 5, wherein the sample enrichment unit further comprises a sampling air passage and an air pumping device, and the sampling port is located between the sampling air passage and the air pumping device; the air suction device can move along the axial direction of the sampling air passage.
8. The aerosol sample analyzer of any of claims 1-5, wherein the thermal analysis unit further comprises a support, and the analysis port is located between the thermal analysis assembly and the support.
9. The aerosol sampling parser of claim 8, wherein the thermal parsing unit further comprises a driving device II, the driving device II can drive the supporting member to move, and the adsorbing sheet is sealed between the air chamber of the thermal parsing assembly and the supporting member.
10. An aerosol analysis system, wherein the aerosol sample analyzer of any of claims 1 to 9 is used in conjunction with ion mobility spectrometry.
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| CN201921473231.9U CN210638974U (en) | 2019-09-05 | 2019-09-05 | Aerosol sampling analyzer and aerosol analysis system |
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| CN201921473231.9U CN210638974U (en) | 2019-09-05 | 2019-09-05 | Aerosol sampling analyzer and aerosol analysis system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112563114A (en) * | 2020-12-11 | 2021-03-26 | 中国科学院大连化学物理研究所 | Gas chromatography differential ion mobility spectrometer and gas path control method thereof |
| CN112577781A (en) * | 2020-12-10 | 2021-03-30 | 中国科学院大连化学物理研究所 | Thermal analysis device for aerosol sampling of linear conversion adsorption sheet |
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2019
- 2019-09-05 CN CN201921473231.9U patent/CN210638974U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112577781A (en) * | 2020-12-10 | 2021-03-30 | 中国科学院大连化学物理研究所 | Thermal analysis device for aerosol sampling of linear conversion adsorption sheet |
| CN112563114A (en) * | 2020-12-11 | 2021-03-26 | 中国科学院大连化学物理研究所 | Gas chromatography differential ion mobility spectrometer and gas path control method thereof |
| CN112563114B (en) * | 2020-12-11 | 2021-08-17 | 中国科学院大连化学物理研究所 | Gas chromatography differential ion mobility spectrometer and gas path control method thereof |
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