CN110400739A - A kind of pressure control sampling device for airborne aerosol mass spectrometer - Google Patents
A kind of pressure control sampling device for airborne aerosol mass spectrometer Download PDFInfo
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- CN110400739A CN110400739A CN201910728948.1A CN201910728948A CN110400739A CN 110400739 A CN110400739 A CN 110400739A CN 201910728948 A CN201910728948 A CN 201910728948A CN 110400739 A CN110400739 A CN 110400739A
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- 239000000443 aerosol Substances 0.000 title claims abstract description 52
- 238000005070 sampling Methods 0.000 title claims abstract description 20
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000004949 mass spectrometry Methods 0.000 abstract description 5
- 238000004458 analytical method Methods 0.000 abstract description 4
- 239000003570 air Substances 0.000 description 60
- 238000005516 engineering process Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 238000012980 aerosol time-of-flight mass spectrometry Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001819 mass spectrum Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010223 real-time analysis Methods 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000005436 troposphere Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/04—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
- H01J49/0404—Capillaries used for transferring samples or ions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/04—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
- H01J49/0409—Sample holders or containers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/04—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
- H01J49/0422—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components for gaseous samples
Abstract
The invention discloses a kind of pressure control sampling devices for airborne aerosol mass spectrometer, including air inlet pipe, air pressure adjustment chamber, sample feeding pipe and air pressure cushion chamber, air inlet pipe is set to the upper end of air pressure adjustment chamber, the first orifice plate is equipped between air inlet pipe and air pressure adjustment chamber, sample feeding pipe is socketed on air pressure adjustment chamber lower end, the lower part of air pressure adjustment chamber is provided with an exhaust outlet, exhaust outlet is connect with an air pump, the lower end of air pressure adjustment chamber and sample feeding pipe is connect with the upper end of pressure buffer chamber, the second orifice plate is equipped between air pressure adjustment chamber and pressure buffer chamber, aperture of the aperture of second orifice plate less than the first orifice plate, pressure buffer chamber with the aerodynamics lens of aerosol mass spectrometer for connecting.Present invention reduces costs consumed by aerosol mass spectrometer system compensation, air pump pumping speed is controlled to maintain pressure buffer chamber air pressure inside to maintain the pressure environment of normal work, enables aerosol mass spectrometer in high aerial efficient, steadily progress on-line mass spectroscopy detection and analysis.
Description
Technical field
The present invention relates to the technical field of aerosol mass spectrometer, more particularly to a kind of for airborne aerosol mass spectrometer
Pressure control sampling device.
Background technique
In recent years, the influence due to aerosol to visibility, air quality and human health and to the direct of weather and
It influences indirectly, aerosol causes the extensive concern of people.In order to solve formation and the propagation process of aerosol, some Novel airs are molten
Glue detecting instrument has been developed, as Worsnop team, Massachusetts Institute Technology develop aerosol mass spectrometer (AMS,
Aerosol Mass Spectrometer), the aerosol flight time mass spectrum developed of the Prather of California, USA university et al.
Instrument (ATOFMS, Aerosol Time Of Flight Mass Spectrometer) and Guangzhou standing grain believe the limited public affairs of instrument share
Take charge of individual particle aerosol mass spectrometer (SPAMS, Single the ParticleAerosol Mass that Zhou Zhen et al. is developed
The online aerosol mass spectrometry analysis instrument such as Spectrometer).Usually using mass spectrography detection aerosol sample when, need by
It is focused into relatively narrow collimated particle beam, in order to measurement diameter system (such as: dual-beam measurement diameter system, particle chopper), ion
Change system (such as: laser ionization source, electron impact ionization source) etc. being capable of effective operation.Currently, Univ Minnesota-Twin Cities USA Liu
Et al. a kind of aerodynamics lens for being developed be that the most common aerosol focuses sampling device, AMS, ATOFMS,
It is widely used in the mass spectrometers such as SPAMS.Aerodynamics lens front entrance usually requires control pressure in middle vacuum environment
(such as 2Torr or so), and in conventional detection, usual ambient pressure environment is about a standard atmospheric pressure, therefore generally before it
A critical hole is arranged in end entrance, and the service pressure of aerodynamics lens is depressed into transition ambient atmosphere.
When carrying out aerosol mass spectrometry analysis under high altitude environment, usually mass spectrometer is placed in aircraft, with aircraft
Flight is measured in real time analysis.And atmospheric pressure increases with height and is reduced in troposphere, aerodynamics lens front pressure
Change with the variation of ambient pressure, so that its efficiency of transmission and focusing performance generate variation, final detection result is generated
It influences.
The mass spectrometric sample introduction interface of conventional aerosol is typically provided with the fixed critical hole in an aperture, with ambient air pressure
Variation, critical hole downstream air pressure change therewith, and being unable to ensure aerodynamics lens can be under conditions of stabilization to aerosol
Sample is effectively transmitted and is focused.When detecting environmental change, due to the variation of ambient pressure, it usually needs to mass spectrograph
Measurement diameter system re-calibrates, and produces unnecessary cost allowance.Therefore, it is necessary to design a kind of sample introduction for capableing of real-time pressure control
Interface arrangement, to ensure that aerodynamics lens can stablize running.
Summary of the invention
It is above-mentioned existing to solve the object of the present invention is to provide a kind of pressure control sampling device for airborne aerosol mass spectrometer
The problem of with the presence of technology, makes aerosol mass spectrometer can efficient, stable, progress mass spectrum inspection in real time under different pressures environment
Analysis is surveyed, measurement diameter system is without correction.
To achieve the above object, the present invention provides following schemes:
The present invention provides a kind of pressure control sampling devices for airborne aerosol mass spectrometer, including air inlet pipe, air pressure tune
Save chamber, sample feeding pipe and air pressure cushion chamber, the air inlet pipe is set to the upper end of the air pressure adjustment chamber, the air inlet pipe with it is described
It is provided with the first orifice plate on the junction of air pressure adjustment chamber, it is intracavitary that the sample feeding pipe is located at the air pressure adjustment, the air pressure tune
The lower end of the lower end and the sample feeding pipe of saving chamber is socketed, and the lower part of the air pressure adjustment chamber is provided with an exhaust outlet, the exhaust
Mouth is connect with an air pump, and the lower end of the air pressure adjustment chamber and the sample feeding pipe is connect with the upper end of the pressure buffer chamber,
It is provided with the second orifice plate on the junction of the air pressure adjustment chamber and the pressure buffer chamber, the aperture of second orifice plate is less than
The aperture of first orifice plate, the pressure buffer chamber with the aerodynamics lens of aerosol mass spectrometer for connecting.
Preferably, the pressure buffer is intracavitary is provided with a pressure sensor, the pressure sensor and a control module
Connection, the control module are connect with the air pump, the pressure data that the control module is measured according to the pressure sensor
Regulate and control the speed of evacuation of the air pump.
Preferably, first orifice plate and second orifice plate are to be detachably connected.
Preferably, between the air inlet pipe and the air pressure adjustment chamber and the air pressure adjustment chamber, the air inlet pipe with
Pass through ring flange between the pressure buffer chamber and is bolted.
Preferably, hole, nozzle or capillary are offered on first orifice plate and second orifice plate.
Preferably, the diameter in hole is 150-200um on first orifice plate, and is provided with different model.
Preferably, the diameter in hole is 80-100um on second orifice plate, and is provided with different model.
Preferably, distance of the air inlet pipe apart from first orifice plate is 70-150cm.
The present invention achieves following technical effect compared with the existing technology:
The present invention overcomes the uncontrollable problems of conventional aerosol mass spectrograph sample introduction pressure, reduce aerosol mass spectrometer system
System corrects consumed cost, controls air pump pumping speed to maintain pressure buffer chamber air pressure inside to maintain the pressure rings of normal work
Border enables aerosol mass spectrometer in high aerial efficient, steadily progress on-line mass spectroscopy detection and analysis.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is structural schematic diagram one of the present invention for the pressure control sampling device of airborne aerosol mass spectrometer；
Fig. 2 is structural schematic diagram two of the present invention for the pressure control sampling device of airborne aerosol mass spectrometer；
Wherein: 1- air inlet pipe, the first orifice plate of 2-, 3- air pressure adjustment chamber, 4- exhaust outlet, 5- air pump, 6- control module, 7- pressure
Force snesor, 8- sample feeding pipe, the second orifice plate of 9-, 10- pressure buffer chamber, 11- aerodynamics lens, 12- aerosol mass spectrometer.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art under the premise of not making the creative labor it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of pressure control sampling devices for airborne aerosol mass spectrometer, to solve existing skill
Art there are the problem of, make aerosol mass spectrometer under different pressures environment can efficiently, stablize, carry out Mass Spectrometer Method point in real time
Analysis, measurement diameter system is without correction.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
It is as shown in Figure 1 to Figure 2: a kind of pressure control sampling device for airborne aerosol mass spectrometer is present embodiments provided,
Including air inlet pipe 1, air pressure adjustment chamber 3, sample feeding pipe 8 and air pressure cushion chamber 10, air inlet pipe 1 is set to the upper end of air pressure adjustment chamber 3,
It is provided with the first orifice plate 2 on the junction of air inlet pipe 1 and air pressure adjustment chamber 3, sample feeding pipe 8 is located in air pressure adjustment chamber 3, air pressure tune
The lower end of the lower end and sample feeding pipe 8 of saving chamber 3 is socketed, and the lower part of air pressure adjustment chamber 3 is provided with an exhaust outlet 4, exhaust outlet 4 and a gas
The lower end of 5 connection of pump, air pressure adjustment chamber 3 and sample feeding pipe 8 is connect with the upper end of pressure buffer chamber 10, air pressure adjustment chamber 3 and gas
It presses and is provided with the second orifice plate 9 on the junction of cushion chamber 10, less than the aperture of the first orifice plate 2, air pressure is slow for the aperture of the second orifice plate 9
Chamber 10 is rushed for connecting with the aerodynamics lens 11 of aerosol mass spectrometer 12.
A pressure sensor 7 is provided in pressure buffer chamber 10, pressure sensor 7 also can choose setting and adjust in pressure
On chamber or air inlet pipe 1.Pressure sensor 7 is connect with a control module 6, and control module 6 is connect with air pump 5,6 basis of control module
The speed of evacuation for the pressure data regulation air pump 5 that pressure sensor 7 measures.
The ring flange for connection is respectively provided on air inlet pipe 1, air pressure adjustment chamber 3, air inlet pipe 1 and pressure buffer chamber 10, into
Between tracheae 1 and air pressure adjustment chamber 3 and between air pressure adjustment chamber 3, air inlet pipe 1 and pressure buffer chamber 10 by ring flange and
It is bolted.First orifice plate 2 is to be detachably connected with the second orifice plate 9.In the present embodiment, the second orifice plate 9 is connected in air inlet pipe 1
With the junction of pressure buffer chamber 10.
Hole, nozzle or capillary are offered on first orifice plate 2 and the second orifice plate 9.Hole on first orifice plate 2 (nozzle or
Capillary) diameter be 150-200um, and be provided with different model；The diameter of hole (nozzle or capillary) on second orifice plate 9
For 80-100um, and it is provided with different model.The distance of 1 the first orifice plate of distance 2 of air inlet pipe is 70-150cm in the present embodiment, is made
The air-flow of entrance is in laminar condition, ensures the steady of 1 air inlet of air inlet pipe.
Specific work process of the present embodiment for the pressure control sampling device of airborne aerosol mass spectrometer is as follows:
Air pump 5 is opened, aerosol to be measured enters from air inlet pipe 1, after first passing through the first orifice plate 2, expands in air pressure adjustment chamber 3
It dissipates and is in laminar condition.The entrance of sample feeding pipe 8 is in aerosol sample even concentration area, and sample segment aerosol is with air pressure
Into sample feeding pipe 8 and by the second orifice plate 9, air pressure adjustment chamber 3 extracts residual gas out by the air pump 5 on exhaust outlet 4.Aerosol
After sample enters pressure buffer chamber 10, aerodynamics lens 11, aerosol mass spectrometer 12 are sequentially entered.
Pressure sensor 7 is equipped in pressure buffer chamber 10, the pressure value measured Real-time Feedback in a manner of electric signal arrives
Control module 6, control module 6 pass through the pressure size judged in pressure buffer chamber 10, and output signal controls 5 pumping speed of air pump, with
The pressure of buffering cavity is adjusted to service pressure.
The present embodiment combination real-time feedback control technology overcomes conventional aerosol mass spectrograph sample introduction pressure and can not control in real time
The problem of processed, reduces cost consumed by instrumental correction, maintains internal cavity in the pressure environment of normal work, makes to bring about the desired sensation molten
Colloid spectrometer can be in high aerial efficient, reliablely and stablely progress on-line mass spectroscopy detection and analysis.
Apply that a specific example illustrates the principle and implementation of the invention in this specification, above embodiments
Explanation be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art,
According to the thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (8)
1. a kind of pressure control sampling device for airborne aerosol mass spectrometer, it is characterised in that: including air inlet pipe, air pressure adjustment
Chamber, sample feeding pipe and air pressure cushion chamber, the air inlet pipe are set to the upper end of the air pressure adjustment chamber, the air inlet pipe and the gas
It presses and is provided with the first orifice plate on the junction of adjusting cavity, it is intracavitary that the sample feeding pipe is located at the air pressure adjustment, the air pressure adjustment
The lower end of chamber and the lower end of the sample feeding pipe are socketed, and the lower part of the air pressure adjustment chamber is provided with an exhaust outlet, the exhaust outlet
It is connect with an air pump, the lower end of the air pressure adjustment chamber and the sample feeding pipe is connect with the upper end of the pressure buffer chamber, institute
It states and is provided with the second orifice plate on the junction of air pressure adjustment chamber and the pressure buffer chamber, the aperture of second orifice plate is less than institute
The aperture of the first orifice plate is stated, the pressure buffer chamber with the aerodynamics lens of aerosol mass spectrometer for connecting.
2. the pressure control sampling device according to claim 1 for airborne aerosol mass spectrometer, it is characterised in that: the gas
It is provided with a pressure sensor in pressure cushion chamber, the pressure sensor is connect with a control module, the control module and institute
Air pump connection is stated, the control module regulates and controls the pumping speed of the air pump according to the pressure data that the pressure sensor measures
Degree.
3. the pressure control sampling device according to claim 1 for airborne aerosol mass spectrometer, it is characterised in that: described
One orifice plate is to be detachably connected with second orifice plate.
4. the pressure control sampling device according to claim 1 for airborne aerosol mass spectrometer, it is characterised in that: it is described into
Lead between tracheae and the air pressure adjustment chamber and between the air pressure adjustment chamber, the air inlet pipe and the pressure buffer chamber
It crosses ring flange and is bolted.
5. the pressure control sampling device according to claim 1 for airborne aerosol mass spectrometer, it is characterised in that: described
Hole, nozzle or capillary are offered on one orifice plate and second orifice plate.
6. the pressure control sampling device according to claim 5 for airborne aerosol mass spectrometer, it is characterised in that: described
The diameter in hole is 150-200um on one orifice plate, and is provided with different model.
7. the pressure control sampling device according to claim 5 for airborne aerosol mass spectrometer, it is characterised in that: described
The diameter in hole is 80-100um on two orifice plates, and is provided with different model.
8. the pressure control sampling device according to claim 1 for airborne aerosol mass spectrometer, it is characterised in that: it is described into
Distance of the tracheae apart from first orifice plate is 70-150cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910728948.1A CN110400739A (en) | 2019-08-08 | 2019-08-08 | A kind of pressure control sampling device for airborne aerosol mass spectrometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910728948.1A CN110400739A (en) | 2019-08-08 | 2019-08-08 | A kind of pressure control sampling device for airborne aerosol mass spectrometer |
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