CN210092028U - Pressure control sample introduction device for airborne aerosol mass spectrometer - Google Patents
Pressure control sample introduction device for airborne aerosol mass spectrometer Download PDFInfo
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- CN210092028U CN210092028U CN201921276812.3U CN201921276812U CN210092028U CN 210092028 U CN210092028 U CN 210092028U CN 201921276812 U CN201921276812 U CN 201921276812U CN 210092028 U CN210092028 U CN 210092028U
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- atmospheric pressure
- pressure
- orifice plate
- aerosol mass
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Abstract
The utility model discloses a sampling device is pressed in accuse for airborne aerosol mass spectrograph, including the intake pipe, the atmospheric pressure chamber of adjusting, advance appearance pipe and atmospheric pressure cushion chamber, the intake pipe sets up in the upper end in atmospheric pressure chamber of adjusting, be equipped with first orifice plate between intake pipe and the atmospheric pressure chamber of adjusting, advance the appearance pipe cup joint in atmospheric pressure chamber lower extreme of adjusting, the lower part in atmospheric pressure chamber of adjusting is provided with a gas vent, the gas vent is connected with an air pump, the lower extreme of atmospheric pressure chamber of adjusting and advance appearance pipe all is connected with the upper end in atmospheric pressure cushion chamber, be equipped with the second orifice plate between atmospheric pressure chamber of adjusting and the atmospheric pressure cushion chamber, the aperture of second orifice plate is less than the aperture of first orifice plate, the atmospheric pressure cushion chamber is used for being connected. The utility model discloses reduced the cost that the correction of aerosol mass spectrograph system consumed, control air pump pumping speed maintains the pressure environment that atmospheric pressure cushion chamber inside atmospheric pressure maintained normal work for the aerosol mass spectrograph can be at high-efficient, carry out online mass spectrometry detection analysis steadily in the high altitude.
Description
Technical Field
The utility model relates to an aerosol mass spectrometer's technical field especially relates to a accuse pressure sampling device for airborne aerosol mass spectrometer.
Background
In recent years, aerosols have attracted a great deal of attention due to their direct and indirect impact on visibility, air quality and human health, as well as on climate. To understand the Aerosol formation and growth process, new Aerosol detection instruments have been developed, such as Aerosol Mass spectrometers (AMS, Aerosol Mass Spectrometer) developed by Worsnop team Of the american academy Of science and technology, Aerosol Time Of Flight Mass Spectrometer (ATOFMS) developed by Prather et al Of the university Of california, and Single Particle Aerosol Mass Spectrometers (SPAMS) developed by shack et al Of the company cantonese, inc. Generally, when mass spectrometry is used to detect an aerosol sample, it is necessary to focus the aerosol sample into a narrow collimated particle beam, so that a diameter measuring system (e.g., a two-beam diameter measuring system, a particle chopper, etc.), an ionization system (e.g., a laser ionization source, an electron bombardment ionization source, etc.), etc. can operate effectively. Currently, an aerodynamic lens developed by Liu et al, university of minnesota, usa, is the most common aerosol focusing sample injection device, and is widely used in mass spectrometry instruments such as AMS, ATOFMS, SPAMS, and the like. The aerodynamic lens front entrance usually needs to be controlled to a medium vacuum environment (e.g. about 2 Torr), and during the conventional detection, the ambient pressure is usually about a standard atmospheric pressure, so a critical hole is usually set at the front entrance to transition the ambient atmospheric pressure to the normal working pressure of the aerodynamic lens.
When aerosol mass spectrometry is performed in an aerial environment, a mass spectrometer is usually placed in an aircraft and is subjected to real-time detection and analysis along with the flight of the aircraft. And the atmospheric pressure in the troposphere is reduced along with the increase of the height, and the pressure at the front end of the aerodynamic lens is changed along with the change of the external pressure, so that the transmission efficiency and the focusing performance of the aerodynamic lens are changed, and the final detection result is influenced.
The sample inlet interface of the traditional aerosol mass spectrometer is generally provided with a critical hole with a fixed aperture, the air pressure of the downstream of the critical hole changes along with the change of the air pressure of the external environment, and the aerodynamic lens cannot be ensured to effectively transmit and focus an aerosol sample under a stable condition. When detecting environmental changes, the mass spectrometer caliper system typically needs to be recalibrated due to changes in ambient pressure, resulting in unnecessary cost loss. Therefore, it is necessary to design a sample inlet interface device capable of controlling the pressure in real time to ensure stable operation of the aerodynamic lens.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a accuse pressure sampling device for airborne aerosol mass spectrograph to solve the problem that above-mentioned prior art exists, make aerosol mass spectrograph can both carry out mass spectrometric detection analysis high-efficiently, stably, in real time under the different pressure environment, the caliper measuring system need not the correction.
In order to achieve the above object, the utility model provides a following scheme:
the utility model provides a pressure control and sample introduction device for an airborne aerosol mass spectrometer, which comprises an air inlet pipe, an air pressure adjusting cavity, a sample introduction pipe and an air pressure buffer cavity, the air inlet pipe is arranged at the upper end of the air pressure adjusting cavity, a first pore plate is arranged at the joint of the air inlet pipe and the air pressure adjusting cavity, the sampling tube is positioned in the air pressure adjusting cavity, the lower end of the air pressure adjusting cavity is sleeved with the lower end of the sampling tube, the lower part of the air pressure adjusting cavity is provided with an exhaust port which is connected with an air pump, the lower ends of the air pressure adjusting cavity and the sample inlet pipe are both connected with the upper end of the air pressure buffer cavity, the atmospheric pressure chamber with be provided with the second orifice plate on the junction of atmospheric pressure cushion chamber, the aperture of second orifice plate is less than the aperture of first orifice plate, the atmospheric pressure cushion chamber is used for being connected with the aerodynamic lens of aerosol mass spectrograph.
Preferably, a pressure sensor is arranged in the air pressure buffer cavity, the pressure sensor is connected with a control module, the control module is connected with the air pump, and the control module regulates and controls the air pumping speed of the air pump according to pressure data measured by the pressure sensor.
Preferably, the first orifice plate and the second orifice plate are detachably connected.
Preferably, the air inlet pipe is connected with the air pressure adjusting cavity, the air pressure adjusting cavity and the air pressure buffering cavity through flanges and bolts.
Preferably, the first orifice plate and the second orifice plate are provided with orifices, nozzles or capillaries.
Preferably, the diameter of the hole on the first pore plate is 150-.
Preferably, the diameter of the hole on the second orifice plate is 80-100um, and is provided with different models.
Preferably, the distance between the air inlet pipe and the first orifice plate is 70-150 cm.
The utility model discloses for prior art gain following technological effect:
the utility model overcomes traditional aerosol mass spectrograph advances the uncontrollable problem of appearance pressure, has reduced the cost that aerosol mass spectrograph system correction consumed, and control air pump is taken out the speed and is kept the inside atmospheric pressure of atmospheric pressure cushion chamber and maintain the pressure environment at normal work for the aerosol mass spectrograph can be at high efficiency in the air, carry out online mass spectrometry detection analysis steadily.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a structural schematic diagram of a pressure control sample introduction device for an airborne aerosol mass spectrometer of the present invention;
fig. 2 is a structural schematic diagram of a pressure control sample introduction device for an airborne aerosol mass spectrometer of the present invention;
wherein: the device comprises a gas inlet pipe 1, a first pore plate 2, an air pressure adjusting cavity 3, an air outlet 4, an air pump 5, a control module 6, a pressure sensor 7, a sample inlet pipe 8, a second pore plate 9, an air pressure buffer cavity 10, an aerodynamic lens 11 and an aerosol mass spectrometer 12.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The utility model aims at providing a accuse pressure sampling device for airborne aerosol mass spectrograph to solve the problem that prior art exists, make aerosol mass spectrograph can both carry out mass spectrometric detection analysis high-efficiently, stably, in real time under the different pressure environment, the caliper measuring system need not the correction.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1 to 2: the embodiment provides a pressure control sample introduction device for an airborne aerosol mass spectrometer, which comprises an air inlet pipe 1 and an air pressure adjusting cavity 3, advance appearance pipe 8 and atmospheric pressure cushion chamber 10, intake pipe 1 sets up in the upper end in atmospheric pressure regulation chamber 3, be provided with first orifice plate 2 on intake pipe 1 and the junction in atmospheric pressure regulation chamber 3, advance appearance pipe 8 and be located atmospheric pressure regulation chamber 3, the lower extreme in atmospheric pressure regulation chamber 3 cup joints with the lower extreme of advancing appearance pipe 8, the lower part in atmospheric pressure regulation chamber 3 is provided with a gas vent 4, gas vent 4 is connected with an air pump 5, the lower extreme in atmospheric pressure regulation chamber 3 and advance appearance pipe 8 all is connected with the upper end in atmospheric pressure cushion chamber 10, be provided with second orifice plate 9 on the junction in atmospheric pressure regulation chamber 3 and atmospheric pressure cushion chamber 10, the aperture of second orifice plate 9 is less than the aperture of first orifice plate 2, atmospheric pressure cushion chamber 10 is used for being connected with the aerodynamic lens 11 of aerosol mass spectrograph 12.
A pressure sensor 7 is arranged in the air pressure buffer cavity 10, and the pressure sensor 7 can also be arranged on the pressure adjusting cavity or the air inlet pipe 1. The pressure sensor 7 is connected with a control module 6, the control module 6 is connected with the air pump 5, and the control module 6 regulates and controls the air pumping speed of the air pump 5 according to pressure data measured by the pressure sensor 7.
The air inlet pipe 1, the air pressure adjusting cavity 3, the air inlet pipe 1 and the air pressure buffering cavity 10 are all provided with flange plates for connection, and the air inlet pipe 1 and the air pressure adjusting cavity 3 as well as the air pressure adjusting cavity 3, the air inlet pipe 1 and the air pressure buffering cavity 10 are all connected through the flange plates and bolts. The first orifice plate 2 and the second orifice plate 9 are detachably connected. In this embodiment, the second orifice 9 is clamped at the connection between the air inlet pipe 1 and the air pressure buffer chamber 10.
The first orifice plate 2 and the second orifice plate 9 are provided with orifices, nozzles or capillaries. The diameter of the hole (nozzle or capillary) on the first orifice plate 2 is 150-; the diameter of the hole (nozzle or capillary) on the second orifice plate 9 is 80-100um, and is provided with different models. In the embodiment, the distance between the air inlet pipe 1 and the first pore plate 2 is 70-150cm, so that the entering air flow is in a laminar flow state, and the air inlet stability of the air inlet pipe 1 is guaranteed.
The specific working process of the pressure control sampling device for the airborne aerosol mass spectrometer is as follows:
and (3) starting the air pump 5, wherein the aerosol to be detected enters from the air inlet pipe 1, passes through the first pore plate 2, diffuses in the air pressure adjusting cavity 3 and is in a laminar flow state. The inlet of the sample inlet pipe 8 is positioned in the aerosol sample concentration uniform zone, part of the sample aerosol enters the sample inlet pipe 8 along with the air pressure and passes through the second pore plate 9, and the air pressure regulating cavity 3 pumps out the residual air through the air pump 5 on the air outlet 4. After entering the air pressure buffer chamber 10, the aerosol sample enters the aerodynamic lens 11 and the aerosol mass spectrometer 12 in sequence.
The pressure sensor 7 is arranged in the air pressure buffer cavity 10, the measured pressure value is fed back to the control module 6 in real time in an electric signal mode, the control module 6 judges the pressure in the air pressure buffer cavity 10, and the output signal controls the pumping speed of the air pump 5 so as to adjust the pressure of the buffer cavity to normal working pressure.
The problem that the traditional aerosol mass spectrometer cannot control the sampling pressure in real time is solved by combining the real-time feedback control technology, the cost consumed by instrument correction is reduced, and the pressure environment of the internal cavity in normal work is maintained, so that the aerosol mass spectrometer can perform online mass spectrum detection and analysis efficiently, stably and reliably in the air.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (8)
1. The utility model provides a accuse pressure sampling device for airborne aerosol mass spectrograph which characterized in that: including intake pipe, atmospheric pressure regulation chamber, advance appearance pipe and atmospheric pressure cushion chamber, the intake pipe set up in the upper end in atmospheric pressure regulation chamber, the intake pipe with be provided with first orifice plate on the junction in atmospheric pressure regulation chamber, advance the appearance pipe and be located the atmospheric pressure regulation intracavity, the lower extreme in atmospheric pressure regulation chamber with the lower extreme of advancing the appearance pipe cup joints, the lower part in atmospheric pressure regulation chamber is provided with an exhaust port, the exhaust port is connected with an air pump, the atmospheric pressure regulation chamber with the lower extreme of advancing the appearance pipe all with the upper end in atmospheric pressure cushion chamber is connected, the atmospheric pressure regulation chamber with be provided with the second orifice plate on the junction in atmospheric pressure cushion chamber, the aperture of second orifice plate is less than the aperture of first orifice plate, the atmospheric pressure cushion chamber is used for being connected with the air dynamics lens of aerosol mass spectrograph.
2. The pressure-controlled sample injection device for an airborne aerosol mass spectrometer of claim 1, wherein: the air pressure buffer cavity is internally provided with a pressure sensor, the pressure sensor is connected with a control module, the control module is connected with the air pump, and the control module regulates and controls the air pumping speed of the air pump according to pressure data measured by the pressure sensor.
3. The pressure-controlled sample injection device for an airborne aerosol mass spectrometer of claim 1, wherein: the first orifice plate and the second orifice plate are detachably connected.
4. The pressure-controlled sample injection device for an airborne aerosol mass spectrometer of claim 1, wherein: the air inlet pipe is connected with the air pressure adjusting cavity, the air inlet pipe and the air pressure buffering cavity through flanges and bolts.
5. The pressure-controlled sample injection device for an airborne aerosol mass spectrometer of claim 1, wherein: and the first orifice plate and the second orifice plate are provided with orifices, nozzles or capillaries.
6. The pressure-controlled sample injection device for an airborne aerosol mass spectrometer of claim 5, wherein: the diameter of the hole on the first pore plate is 150-.
7. The pressure-controlled sample injection device for an airborne aerosol mass spectrometer of claim 5, wherein: the diameter of the hole on the second pore plate is 80-100um, and different models are arranged.
8. The pressure-controlled sample injection device for an airborne aerosol mass spectrometer of claim 1, wherein: the distance between the air inlet pipe and the first orifice plate is 70-150 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921276812.3U CN210092028U (en) | 2019-08-08 | 2019-08-08 | Pressure control sample introduction device for airborne aerosol mass spectrometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921276812.3U CN210092028U (en) | 2019-08-08 | 2019-08-08 | Pressure control sample introduction device for airborne aerosol mass spectrometer |
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| CN210092028U true CN210092028U (en) | 2020-02-18 |
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| CN201921276812.3U Expired - Fee Related CN210092028U (en) | 2019-08-08 | 2019-08-08 | Pressure control sample introduction device for airborne aerosol mass spectrometer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110400739A (en) * | 2019-08-08 | 2019-11-01 | 北京市人工影响天气办公室 | A kind of pressure control sampling device for airborne aerosol mass spectrometer |
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2019
- 2019-08-08 CN CN201921276812.3U patent/CN210092028U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110400739A (en) * | 2019-08-08 | 2019-11-01 | 北京市人工影响天气办公室 | A kind of pressure control sampling device for airborne aerosol mass spectrometer |
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Granted publication date: 20200218 Termination date: 20210808 |