CN216084789U - Corona discharge ion source assembly and ion mobility spectrometer - Google Patents
Corona discharge ion source assembly and ion mobility spectrometer Download PDFInfo
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- CN216084789U CN216084789U CN202122008894.7U CN202122008894U CN216084789U CN 216084789 U CN216084789 U CN 216084789U CN 202122008894 U CN202122008894 U CN 202122008894U CN 216084789 U CN216084789 U CN 216084789U
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Abstract
The utility model provides a corona discharge ion source assembly and an ion mobility spectrometer, wherein the corona discharge ion source assembly comprises a corona area, a repulsion area, a reaction area, a sample inlet and an insulation main body, wherein the corona area is provided with a first corona ionization mechanism and a second corona ionization mechanism which are mutually independent, the first corona ionization mechanism and the second corona ionization mechanism are mutually insulated and arranged at intervals, and the first corona ionization mechanism is communicated with a pulse direct current positive high voltage and used for generating a positive corona; the second corona ionization mechanism is connected with the pulse direct current negative high voltage and is used for generating negative corona. The composition structure of the ion mobility spectrometer comprises the corona discharge ion source assembly and the single migration tube, so that the occupied space is saved, and the lightweight of the instrument is realized. The ion mobility spectrometer also comprises a gas circuit system and a circuit system, and the detection requirements of various gases are met simultaneously, so that low power consumption and long endurance of the ion mobility spectrometer are finally realized.
Description
Technical Field
The utility model relates to the technical field of analysis test and safety detection, in particular to a corona discharge ion source assembly and an ion mobility spectrometer.
Background
The ion mobility spectrometry is a trace detection technology based on a molecular level, and realizes separation and qualification of substances according to the difference of drift rates of different ions under a uniform weak electric field. Because of the advantages of simple structure, high sensitivity, rapid detection and the like, the ion mobility spectrometer has been widely applied to the fields of chemical defense, anti-terrorism, explosion prevention, drug enforcement and the like, and becomes the mainstream technology for the on-site rapid reconnaissance of trace substances.
The ion source is a core component of the ion mobility spectrometer and has the functions of ionizing sample molecules to be detected into charged ion groups under the atmospheric pressure condition, enabling the charged ion groups to reach a migration region through periodically opened ion gates and to be separated under the action of a uniform weak electric field of the migration region, and finally receiving and detecting the separated ion groups by a charge receiving electrode. When positive polarity high voltage is applied to the migration tube, the ion mobility spectrometer works in a positive mode, can finish the detection of positive ions, and mainly realizes the detection of drugs, chemical reagents, toxic and harmful gases and entropy explosives (TATP); when the high voltage applied to the drift tube is negative, the ion mobility spectrometer can complete the detection of most explosives (nitrogen-containing compounds) by working in a negative mode.
With the development of ionization technology, radioactive ionization technology begins to gradually exit the civil market, and is replaced by non-radioactive ionization technology such as pulsed corona discharge, ultraviolet ionization, electrospray, glow discharge, dielectric barrier discharge, laser-assisted desorption and the like. Among them, the pulse corona discharge and the ultraviolet ionization technique are most widely penetrated in the mature commercial products. The mobility spectrometer based on the radioactive ionization source and the ultraviolet ionization source can conveniently implement positive and negative switching of electric field polarity on a single migration tube, can meet the detection requirements of drugs, explosives and toxic and harmful gases, can greatly reduce the power consumption of the whole mobility spectrometer, reduce the volume of the whole mobility spectrometer, and enhance the portability and the cruising ability of equipment. However, in the prior art, because the voltage for generating positive and negative corona discharge and the curvature of the needle point are different, the voltage difference between the positive polarity and the negative polarity is large, and the parasitic resistance/capacitance is high, the polarity switching of the corona discharge is directly completed on a set of ionization structure, which has a great difficulty.
SUMMERY OF THE UTILITY MODEL
In view of the above drawbacks of the prior art, an object of the present invention is to provide a corona discharge ion source and an ion mobility spectrometer, which are used to solve the problem in the prior art that it is difficult to complete polarity switching of corona discharge on one set of ionization structure.
To achieve the above and other related objects, the present invention provides a corona discharge ion source assembly comprising:
the corona region is provided with a first corona ionization mechanism and a second corona ionization mechanism which are mutually independent, the first corona ionization mechanism and the second corona ionization mechanism are mutually insulated and arranged at intervals, and the first corona ionization mechanism is communicated with the pulse direct current positive high voltage and used for generating positive corona; the second corona ionization mechanism is communicated with the pulse direct current negative high voltage and is used for generating negative corona;
the repelling zone is positioned at the front end of the corona zone and is provided with a first repelling electrode and a second repelling electrode, the first repelling electrode is positioned at the front end of the first corona ionization mechanism, and the second repelling electrode is positioned at the front end of the second corona ionization mechanism;
the reaction zone is positioned at the rear end of the corona zone and is provided with a reaction zone electrode, and the reaction zone electrode is annularly arranged inside the rear end of the corona discharge ion source assembly;
the sample inlet is arranged on the side wall between the corona area and the reaction area;
the insulating main part is embedded with the above parts of the corona discharge ion source assembly.
Optionally, the first corona ionization mechanism is structurally the same as the second corona ionization mechanism, and includes: a corona electrode, a corona needle assembly and a corona discharge torch; the corona electrode is a tubular electrode, penetrates through the side wall of the corona discharge ion source assembly and can discharge corona waste gas; the corona electrode is electrically connected with the corona needle assembly, the corona needle assembly comprises a needle array formed by uniformly arranging a plurality of corona needles, and the corona needle assembly is used for corona discharge; the corona discharge lamp is arranged around the corona needle assembly and forms a needle-cylinder discharge structure with the corona needle assembly.
Further, the height of the corona electrode can be adjusted up and down, and the height of the corona needle assembly can also be adjusted up and down.
Optionally, still be provided with the electrode lead on the corona electrode, the corona electrode with electrode lead formula structure as an organic whole.
Optionally, the insulating body is a PEEK or ceramic body having insulating properties.
The utility model also provides an ion mobility spectrometer, which comprises the corona discharge ion source assembly and a migration tube, wherein the front end of the migration tube is connected with the rear end of the corona discharge ion source assembly, and the migration tube comprises:
the storage area is positioned at the front end of the migration tube and is sequentially provided with a storage gate grid electrode, a first ion gate and an ion injection gate grid electrode from front to back, wherein the storage gate grid electrode is of a horn-shaped structure which is closed from front to back;
the migration area is positioned at the rear end of the storage area and is provided with a plurality of annular migration electrodes and a plurality of annular insulating gaskets, and the plurality of migration electrodes and the plurality of insulating gaskets are alternately arranged along the central axis direction of the migration pipe;
the air exhaust pipe is arranged on the side wall between the storage area and the migration area;
a Faraday shield electrode disposed at a rear end of the migration zone;
a Faraday cup fixedly embedded in the Faraday shield electrode;
and the migration gas inlet pipe is arranged on the side wall of the Faraday shielding electrode.
Optionally, the ion mobility spectrometer further comprises a gas path system, the gas path system comprises a sample gas path module, the sample gas path module is communicated with the sample inlet, the sample gas path module comprises a main gas path module, a calibration gas path module and a branch gas path module, the calibration gas path module and the branch gas path module are connected in parallel, and a calibrator is arranged in the calibration gas path module; the sample inlet gas circuit module is also internally provided with a two-position three-way electromagnetic valve, the calibration gas circuit module and the branch gas circuit module which are connected in parallel are connected with the main gas circuit module in series through the two-position three-way electromagnetic valve, a first port of the two-position three-way electromagnetic valve is communicated with the main gas circuit module, a second port of the two-position three-way electromagnetic valve is communicated with the calibration gas circuit module, and a third port of the two-position three-way electromagnetic valve is communicated with the branch gas circuit module.
Furthermore, the gas path system also comprises a circulating gas path module, one end of the circulating gas path module is respectively communicated with the corona electrode and the exhaust gas pipe, and the other end of the circulating gas path module is respectively communicated with the main gas path module and the migration gas inlet pipe; the circulating gas circuit module further comprises a filter, a circulating pump and a buffering device which are connected in series, wherein the buffering device is used for absorbing airflow jitter caused by pulse airflow in the circulating pump on one hand so as to reduce airflow disturbance to the migration area, and on the other hand is used for gas distribution, one part of gas enters the migration pipe through the migration gas inlet pipe and is used as migration gas, and the other part of gas enters the sample injection gas circuit module and is used as carrier gas.
Furthermore, the ion mobility spectrometer also comprises a circuit system, wherein the circuit system comprises a corona high-voltage power supply board, a migration tube high-voltage power supply board and a control board, and the control board is used for controlling the corona high-voltage power supply board and the migration tube high-voltage power supply board to generate periodic pulses; the corona high-voltage power supply board is provided with a first power supply module and a second power supply module, the first power supply module is used for connecting the first repulsion electrode and the corona discharge torch in the first corona ionization mechanism, and the second power supply module is used for connecting the second repulsion electrode and the corona discharge torch in the second corona ionization mechanism; the migration tube high-voltage power supply board is used for being connected with the reaction zone electrode, the storage zone and the plurality of migration electrodes, wherein a plurality of series loads are arranged between the migration tube high-voltage power supply board and the plurality of migration electrodes, and the plurality of migration electrodes are sequentially connected with one end of each load.
Furthermore, the control board is used for generating periodic positive pulses, periodic negative pulses or periodic positive-zero-negative pulses, and the corona high-voltage power supply board and the migration tube high-voltage power supply board are both provided with a boosting module for boosting pulses; the corona high-voltage power supply board further comprises a first selection control module connected with the control board, the first selection control module is used for controlling the on-off of the first power supply module and the second power supply module, the first power supply module is used for providing periodic positive pulses, and the second power supply module is used for providing periodic negative pulses; the transfer tube high-voltage power supply board comprises a third power supply module and a second selection control module connected with the control board, wherein the second selection control module is used for controlling the third power supply module to provide periodic positive pulses, periodic negative pulses or periodic positive-zero-negative pulses.
As described above, the corona discharge ion source assembly and the ion mobility spectrometer of the present invention have the following advantages: by arranging two sets of corona ionization mechanisms which are mutually independent, spaced and insulated on one migration tube, not only is the occupied space saved, but also the light weight of the instrument is realized. In addition, a corona ionization mechanism of the device is communicated with pulse positive high voltage and works in a positive corona mode; the other corona ionization mechanism is communicated with the pulse negative high voltage and works in a negative corona mode. Through the orderly break-make of control two corona ionization mechanisms, can realize going on in turn of two kinds of mode, the positive, negative polarity switching of single migration pipe is mated again, can satisfy the detection demand of drugs, explosive and poisonous and harmful gas simultaneously to finally realize the low-power consumption and the long continuation of the journey of ion mobility spectrometer.
Drawings
Fig. 1 is a schematic diagram of a corona discharge ion source assembly according to the present invention.
Fig. 2 is a schematic cross-sectional structure diagram of the ion mobility spectrometer according to the present invention.
Fig. 3 is a schematic perspective sectional view of an ion mobility spectrometer according to the present invention.
Fig. 4 is a schematic structural diagram of an ion mobility spectrometer and a gas path system thereof according to the present invention.
Fig. 5 is a schematic structural diagram of an ion mobility spectrometer and its circuitry according to the present invention.
Description of the element reference numerals
1 Corona discharge ion source assembly
11 first corona ionization mechanism
111 corona electrode
112 corona needle assembly
113 corona discharge lamp
12 second corona ionization mechanism
13 first repulsion electrode
14 second repelling electrode
15 reaction zone electrode
16 sample inlet
17 insulating body
2 migration tube
21 storage gate electrode
22 first ion gate
23 ion implantation gate electrode
24 migration electrode
25 insulating spacer
26 air exhaust pipe
27 Faraday shield electrode
28 Faraday cup
29 migration gas inlet pipe
3 gas path system
31 sample introduction gas circuit module
32 circulation gas circuit module
4 circuit system
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The utility model is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in actual implementation, and the type, amount, position relationship and proportion of the components in actual implementation can be changed freely on the premise of implementing the technical solution, and the layout of the components may be more complicated.
As shown in fig. 1 and 4, the present invention provides a corona discharge ion source assembly 1, the corona discharge ion source assembly 1 includes a corona region, a repulsion region, a reaction region, a sample inlet 16 and an insulating body 17, wherein the corona region is provided with a first corona ionization mechanism 11 and a second corona ionization mechanism 12 which are independent of each other, the first corona ionization mechanism 11 and the second corona ionization mechanism 12 are insulated from each other and arranged at intervals, and the first corona ionization mechanism 11 is connected with a pulsed direct current positive high voltage for generating a positive corona; the second corona ionization mechanism 12 is connected with a pulse direct current negative high voltage and is used for generating a negative corona; the repelling region is positioned at the front end of the corona region and is provided with a first repelling electrode 13 and a second repelling electrode 14, the first repelling electrode 13 is positioned at the front end of the first corona ionization mechanism 11, and the second repelling electrode 14 is positioned at the front end of the second corona ionization mechanism 12; the reaction zone is positioned at the rear end of the corona zone and is provided with a reaction zone electrode 15, and the reaction zone electrode 15 is annularly arranged inside the rear end of the corona discharge ion source assembly 1; the sample inlet 16 is arranged on the side wall between the corona area and the reaction area; the insulating body 17 is embedded with the above components of the corona discharge ion source assembly.
It should be noted that in other embodiments, the first corona ionization mechanism 11 may also be connected with a pulsed dc negative high voltage for generating a negative corona; the corresponding second corona ionization mechanism 12 is connected to a pulsed dc positive high voltage for generating a positive corona. Therefore, the protection scope of the present invention should not be limited to a specific range, as long as one of the two corona ionization mechanisms is connected to the pulsed dc positive high voltage and the other is connected to the pulsed dc negative high voltage.
In addition, respectively set up a repulsion electrode at two corona ionization mechanism's front end, the repulsion electrode is used for repelling positive ion/the anion that corona ionization mechanism discharge process produced and gets into in the reaction zone electrode, these positive ion/anion with the warp the sample molecule that introduction port 16 got into takes place ionic reaction and/or ion-molecular reaction and forms the product ion. In addition, the position of the sample inlet 16 is preferably on a perpendicular bisector of a connecting line of the two corona ionization mechanisms.
As an example, as shown in fig. 1, the discharge structure in the corona ionization mechanism mainly has a needle-plate, needle-needle, needle-mesh (ring) and needle-cylinder structure, and the present invention preferably adopts the needle-cylinder discharge structure, because the needle array shaped like a wolf tooth stick can improve the stability of corona discharge and the life of corona needle. Specifically, the first corona ionization mechanism 11 and the second corona ionization mechanism 12 have the same structure, and include: a corona electrode 111, a corona needle assembly 112 and a corona discharge tube 113; the corona electrode 111 is a tubular electrode, penetrates through the side wall of the corona discharge ion source assembly 1, and can discharge corona exhaust gas; the corona electrode 111 is electrically connected with the corona needle assembly 112, the corona needle assembly 112 comprises a needle array formed by uniformly arranging a plurality of corona needles, and the corona needle assembly is used for corona discharge; the corona discharge torch 113 surrounds the corona pin assembly and forms a pin-and-barrel discharge structure with the corona pin assembly.
As an example, the height of the corona electrode 111 can be adjusted up and down, and the corona electrode 111 is fixedly connected with the corona pin assembly 112, so that the height of the corona pin assembly 112 can also be adjusted up and down.
As an example, an electrode lead is further disposed on the corona electrode 111, and the electrode lead is led out from the corona electrode 111 for connecting with an external circuit system. Corona electrode 111 with electrode lead wire formula structure as an organic whole has good structural stability.
The insulating body 17 is used for insulation protection, and the material thereof is preferably PEEK (polyetheretherketone) or a ceramic body, which has good insulation properties.
As shown in fig. 2 to 4, the present invention further provides an ion mobility spectrometer, which includes the corona discharge ion source assembly 1 described above, and further includes a migration tube 2, a front end of the migration tube 2 is connected to a rear end of the corona discharge ion source assembly 1, and the migration tube includes: the ion source assembly comprises a storage area, a migration area, an exhaust gas pipe 26, a faraday shielding electrode 27, a faraday cup 28 and a migration gas inlet pipe 29, wherein the storage area is positioned at the front end of the migration pipe 2, and a storage gate grid electrode 21, a first ion gate 22 and an ion injection gate grid electrode 23 are sequentially arranged from front to back, wherein the storage gate grid electrode 21 is a horn-shaped structure which is closed from front to back, and can also be called a focusing structure, and the focusing structure can receive all product ions and reaction ions from the corona discharge ion source assembly 1 and provide proper molecular ion reaction time; on the other hand, the ion group between the corona discharge ion source assembly 1 and the first ion gate 22 can be compressed axially, so that the ion density of the ion group is improved; the migration area is positioned at the rear end of the storage area and is provided with a plurality of annular migration electrodes 24 and a plurality of annular insulating gaskets 25, and the plurality of migration electrodes 24 and the plurality of insulating gaskets 25 are alternately arranged along the central axis direction of the migration tube 2; the exhaust pipe 26 is arranged on the side wall between the storage area and the migration area; the faraday shield electrode 27 is disposed at the rear end of the migration zone; the faraday cup 28 is fixedly embedded in the faraday shield electrode 27; the migration gas inlet pipe 29 is disposed on a side wall of the faraday shield electrode 27.
The working principle of the ion mobility spectrometer is as follows: the product ions generated by the corona discharge ion source assembly 1 enter the migration region through the storage region, the product ions are subjected to directional drift under the action of an electric field in the migration region, the Faraday cup 28 receives the ions to form weak current, and the weak current is amplified to obtain a signal peak of the ions. The different ions arrive at the faraday cup 28 at different times due to their different migration rates in the electric field, so that the composition of the ion product can be distinguished.
As an example, as shown in fig. 2 to 4, the ion mobility spectrometer further includes a gas path system 3, the gas path system 3 includes a sample gas path module 31, wherein the sample gas path module 31 is communicated with the sample inlet 16, the sample gas path module 31 includes a main gas path module, and a calibration gas path module and a branch gas path module that are connected in parallel, and a calibrant is disposed in the calibration gas path module; the sample inlet gas circuit module is also internally provided with a two-position three-way electromagnetic valve, the calibration gas circuit module and the branch gas circuit module which are connected in parallel are connected with the main gas circuit module in series through the two-position three-way electromagnetic valve, a first port of the two-position three-way electromagnetic valve is communicated with the main gas circuit module, a second port of the two-position three-way electromagnetic valve is communicated with the calibration gas circuit module, and a third port of the two-position three-way electromagnetic valve is communicated with the branch gas circuit module.
As an example, as shown in fig. 2 to 4, the gas path system further includes a circulating gas path module 32, one end of the circulating gas path module 32 is respectively communicated with the corona electrode 111 (for discharging corona exhaust gas) and the gas discharge pipe 26, and the other end of the circulating gas path module 32 is respectively communicated with the main gas path module and the migration gas inlet pipe 29; circulation gas circuit module 32 is still including the filter, circulating pump and the buffer of series connection, wherein, buffer is used for absorbing on the one hand the air current shake that pulse air current arouses in the circulating pump, it is right to reduce the air current disturbance in migration district, on the other hand is used for gas distribution, and partly gaseous passes through migration gas intake pipe 29 gets into be used as the migration gas in the migration pipe 2, another part gas gets into advance kind gas circuit module 31 and be used as the carrier gas, pass through introduction port 16 gets into as the introduction gas corona discharge ion source subassembly 1. The gas circuit system enables corona waste gas and exhaust gas in the migration pipe 2 to be pumped out under the negative pressure effect of the circulating pump, and the filter purifies the exhaust gas and enters the ion mobility spectrometer as the migration gas and sample injection gas, so that the purification and the cyclic utilization of the corona waste gas and the exhaust gas are realized.
As an example, as shown in fig. 2, 3 and 5, the ion mobility spectrometer further includes a circuit system 4, where the circuit system 4 includes a corona high-voltage power board, a migration tube high-voltage power board and a control board, and the control board is used for controlling the corona high-voltage power board and the migration tube high-voltage power board to generate periodic pulses; the corona high-voltage power supply board is provided with a first power supply module (generating positive voltage) and a second power supply module (generating negative voltage), wherein the first power supply module is used for connecting the first repelling electrode 13 (voltage + V voltage supply)p1) And the corona electrode 111 (supply voltage + V) in the first corona ionization mechanism 11c1) And the corona discharge lamp 113 (voltage supply + V)c2) And the second power supply module is used for connecting the second repulsion electrode 14 (supply voltage-V)p1) And the corona electrode (pressure-supply-V) of the second corona ionization mechanism 12c1) And the corona discharge torch (voltage supply-V)c2) (ii) a The migration tube high-voltage power supply board is used for connecting the reaction area electrode 15 (supply voltage +/-V)r1) The storage gate electrode 21 (supply voltage + -V)g1) Ion implantation gate electrode 23 (voltage supply + -V)g2) And a plurality of the migration electrodes 24, wherein a plurality of series loads are arranged between the migration tube high-voltage power supply board and the plurality of the migration electrodes 24, and the plurality of the migration electrodes 24 are sequentially connected with one end of each load.
Specifically, the control board is used for generating periodic positive pulses, periodic negative pulses or periodic positive-zero-negative pulses, and the corona high-voltage power supply board and the migration tube high-voltage power supply board are both provided with a boosting module for boosting pulses; the corona high-voltage power supply board further comprises a first selection control module connected with the control board, the first selection control module is used for controlling the on-off of the first power supply module and the second power supply module, the first power supply module is used for providing periodic positive pulses, and the second power supply module is used for providing periodic negative pulses; the transfer tube high-voltage power supply board comprises a third power supply module and a second selection control module connected with the control board, wherein the second selection control module is used for controlling the third power supply module to provide periodic positive pulses, periodic negative pulses or periodic positive-zero-negative pulses. It should be noted that the switching of the positive and negative polarities of a single transfer tube is matched with the operation mode (positive corona mode or negative corona mode) of the corona discharge ion source assembly 1, so as to ensure the normal operation of the ion mobility spectrometer.
As an example, the circuit system 4 further includes a signal amplification circuit, a temperature control circuit, and a data acquisition circuit, wherein the signal amplification circuit is connected to the faraday cup 28, the signal amplification circuit amplifies weak current generated by receiving ions by the faraday cup 28, and the data acquisition circuit is connected to the signal amplification circuit and configured to receive an amplified electrical signal and acquire data. The temperature control circuit is connected with a heating device capable of rapidly heating the sample in the ion mobility spectrometer and is used for regulating and controlling the temperature of the heating device.
When detecting target substances which are easy to form cationic groups, such as drugs, toxic and harmful gases and the like, an upper computer (operation software) positive measurement mode can be selected, control software drives a control panel circuit to generate periodic positive pulses, the positive pulses are boosted by a boosting module of a corona high-voltage power panel and then applied to the first corona ionization mechanism 11 and the first repulsion electrode 13, positive ions generated by the first corona ionization mechanism 11 move towards the migration tube 2 under the action of the first repulsion electrode 13, and the positive ions react with sample molecules in the moving process to generate product cations; meanwhile, the positive pulse generated by the control board circuit is boosted by the boosting module of the migration tube high-voltage power supply board and then applied to the reaction area electrode 15 and the migration tube 2, so that cations can pass through the migration tube 2 and be detected. The material characterization is realized by measuring the flight time of the cation.
When target substances such as explosives and the like which are easy to form anion groups are required to be detected, an upper computer negative measurement mode can be selected, control software drives a control panel circuit to generate periodic negative pulses, the negative pulses are boosted by a boosting module of a corona high-voltage power panel and then applied to the second corona ionization mechanism 12 and the second repulsion electrode 14, anions generated by the second corona ionization mechanism 12 move towards the migration tube 2 under the action of the second repulsion electrode 14, and the anions react with sample molecules in the moving process to generate product anions; meanwhile, negative pulses generated by the control panel circuit are boosted by the boosting module of the migration tube high-voltage power supply board and then applied to the reaction area electrode 15 and the migration tube 2, so that anions can pass through the migration tube 2 and be detected. The material characterization is realized by measuring the flight time of the anion.
When drugs, explosives and toxic and harmful gases need to be detected simultaneously, an upper computer double-measurement mode can be selected, control software drives a control board circuit to generate periodic positive-zero-negative pulses, the periodic positive-zero-negative pulses are boosted through a boosting module of a corona high-voltage power board, the boosted positive pulses are applied to the first corona ionization mechanism 11 and the first repulsion electrode 13 and work in a positive corona mode, positive ions generated by the first corona ionization mechanism 11 move towards the migration tube 2 under the action of the first repulsion electrode 13, and the positive ions react with sample molecules in the moving process to generate product cations; the negative pulse after stepping up is applyed second corona ionization mechanism 12 with work is in negative corona mode on the second repulsion electrode 14, the anion that second corona ionization mechanism 12 produced is in under the second repulsion electrode 14 effect to migration pipe 2 removes, and the anion is at the removal in-process with sample molecule reaction formation product anion. The two working modes are alternately carried out. Meanwhile, positive-zero-negative pulses generated by a control board circuit are applied to the reaction area electrode 15 and the migration tube 2 after being boosted by a boosting module of the migration tube high-voltage power supply board, and the switching of the positive polarity and the negative polarity of the voltage applied to the reaction area electrode 15 and the migration tube 2 always synchronously corresponds to the alternation of a positive corona mode and a negative corona mode. And (3) sequentially completing the detection of the easily formed cationic groups and the easily formed anionic groups in the tested sample according to the measurement mode. Under the zero pulse mode, the corona high-voltage power supply board, the migration tube high-voltage power supply board and the ion mobility spectrometer are grounded and conducted, so that the residual charges are quickly released, and the polarity switching stability and switching speed of the instrument are improved.
In summary, the present invention provides a corona discharge ion source assembly and an ion mobility spectrometer, wherein the corona discharge ion source assembly includes a corona region, a repulsion region, a reaction region, a sample inlet and an insulation main body, wherein the corona region includes a first corona ionization mechanism and a second corona ionization mechanism which are independent from each other, the first corona ionization mechanism and the second corona ionization mechanism are insulated from each other and arranged at an interval to form a corona region, and the first corona ionization mechanism is connected with a pulsed dc positive high voltage for generating a positive corona; the second corona ionization mechanism is communicated with the pulse direct current negative high voltage and is used for generating negative corona; the repelling zone is positioned at the front end of the corona zone and comprises a first repelling electrode and a second repelling electrode, the first repelling electrode is positioned at the front end of the first corona ionization mechanism, and the second repelling electrode is positioned at the front end of the second corona ionization mechanism; the reaction zone is positioned at the rear end of the corona zone and comprises a reaction zone electrode, and the reaction zone electrode is annularly arranged inside the rear end of the corona discharge ion source assembly; the sample inlet is arranged on the side wall between the corona area and the reaction area; the insulating body is disposed outside the corona discharge ion source assembly. The composition structure of the ion mobility spectrometer comprises the corona discharge ion source assembly and a single migration tube, and the ion mobility spectrometer further comprises a gas circuit system and a circuit system.
The corona discharge ion source assembly and the ion mobility spectrometer have the following beneficial effects: by arranging two sets of corona ionization mechanisms which are mutually independent, spaced and insulated on one migration tube, not only is the occupied space saved, but also the light weight of the instrument is realized. In addition, a corona ionization mechanism of the device is communicated with pulse positive high voltage and works in a positive corona mode; the other corona ionization mechanism is communicated with the pulse negative high voltage and works in a negative corona mode. Through the orderly break-make of control two corona ionization mechanisms, can realize going on in turn of two kinds of mode, the positive, negative polarity switching of single migration pipe is mated again, can satisfy the detection demand of drugs, explosive and poisonous and harmful gas simultaneously to finally realize the low-power consumption and the long continuation of the journey of ion mobility spectrometer. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the utility model. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A corona discharge ion source assembly, comprising:
the corona region is provided with a first corona ionization mechanism and a second corona ionization mechanism which are mutually independent, the first corona ionization mechanism and the second corona ionization mechanism are mutually insulated and arranged at intervals, and the first corona ionization mechanism is communicated with the pulse direct current positive high voltage and used for generating positive corona; the second corona ionization mechanism is communicated with the pulse direct current negative high voltage and is used for generating negative corona;
the repelling zone is positioned at the front end of the corona zone and is provided with a first repelling electrode and a second repelling electrode, the first repelling electrode is positioned at the front end of the first corona ionization mechanism, and the second repelling electrode is positioned at the front end of the second corona ionization mechanism;
the reaction zone is positioned at the rear end of the corona zone and is provided with a reaction zone electrode, and the reaction zone electrode is annularly arranged inside the rear end of the corona discharge ion source assembly;
the sample inlet is arranged on the side wall between the corona area and the reaction area;
the insulating main part is embedded with the above parts of the corona discharge ion source assembly.
2. The corona discharge ion source assembly of claim 1, wherein: first corona ionization mechanism with second corona ionization mechanism structure is the same, includes: a corona electrode, a corona needle assembly and a corona discharge torch; the corona electrode is a tubular electrode, penetrates through the side wall of the corona discharge ion source assembly and can discharge corona waste gas; the corona electrode is electrically connected with the corona needle assembly, the corona needle assembly comprises a needle array formed by uniformly arranging a plurality of corona needles, and the corona needle assembly is used for corona discharge; the corona discharge tube surrounds the corona needle assembly and forms a needle-tube discharge structure with the corona needle assembly.
3. The corona discharge ion source assembly of claim 2, wherein: the height of the corona electrode can be adjusted up and down, and the height of the corona needle assembly can also be adjusted up and down.
4. The corona discharge ion source assembly of claim 2, wherein: still be provided with the electrode lead wire on the corona electrode, the corona electrode with electrode lead wire formula structure as an organic whole.
5. The corona discharge ion source assembly of claim 1, wherein: the insulating main body is a PEEK or ceramic main body with insulating property.
6. An ion mobility spectrometer comprising the corona discharge ion source assembly of any one of claims 1 to 5, further comprising a transfer tube, the front end of the transfer tube being connected to the back end of the corona discharge ion source assembly, the transfer tube comprising:
the storage area is positioned at the front end of the migration tube and is sequentially provided with a storage gate grid electrode, a first ion gate and an ion injection gate grid electrode from front to back, wherein the storage gate grid electrode is of a horn-shaped structure which is closed from front to back;
the migration area is positioned at the rear end of the storage area and is provided with a plurality of annular migration electrodes and a plurality of annular insulating gaskets, and the plurality of migration electrodes and the plurality of insulating gaskets are alternately arranged along the central axis direction of the migration pipe;
the air exhaust pipe is arranged on the side wall between the storage area and the migration area;
a Faraday shield electrode disposed at a rear end of the migration zone;
a Faraday cup fixedly embedded in the Faraday shield electrode;
and the migration gas inlet pipe is arranged on the side wall of the Faraday shielding electrode.
7. The ion mobility spectrometer of claim 6, further comprising a gas path system, wherein the gas path system comprises a sample gas path module, wherein the sample gas path module is communicated with the sample inlet, the sample gas path module comprises a main gas path module and a calibration gas path module and a branch gas path module which are connected in parallel, and wherein a calibrant is disposed in the calibration gas path module; the sample inlet gas circuit module is also internally provided with a two-position three-way electromagnetic valve, the calibration gas circuit module and the branch gas circuit module which are connected in parallel are connected with the main gas circuit module in series through the two-position three-way electromagnetic valve, a first port of the two-position three-way electromagnetic valve is communicated with the main gas circuit module, a second port of the two-position three-way electromagnetic valve is communicated with the calibration gas circuit module, and a third port of the two-position three-way electromagnetic valve is communicated with the branch gas circuit module.
8. The ion mobility spectrometer of claim 7, wherein: the gas path system also comprises a circulating gas path module, one end of the circulating gas path module is respectively communicated with the corona electrode and the gas exhaust pipe, and the other end of the circulating gas path module is respectively communicated with the main gas path module and the migration gas inlet pipe; the circulating gas circuit module further comprises a filter, a circulating pump and a buffering device which are connected in series, wherein the buffering device is used for absorbing airflow jitter caused by pulse airflow in the circulating pump on one hand so as to reduce airflow disturbance to the migration area, and on the other hand is used for gas distribution, one part of gas enters the migration pipe through the migration gas inlet pipe and is used as migration gas, and the other part of gas enters the sample injection gas circuit module and is used as carrier gas.
9. The ion mobility spectrometer of claim 8, wherein: the ion mobility spectrometer also comprises a circuit system, wherein the circuit system comprises a corona high-voltage power supply board, a migration tube high-voltage power supply board and a control board, and the control board is used for controlling the corona high-voltage power supply board and the migration tube high-voltage power supply board to generate periodic pulses; the corona high-voltage power supply board is provided with a first power supply module and a second power supply module, the first power supply module is used for connecting the first repulsion electrode and the corona discharge torch in the first corona ionization mechanism, and the second power supply module is used for connecting the second repulsion electrode and the corona discharge torch in the second corona ionization mechanism; the migration tube high-voltage power supply board is used for being connected with the reaction zone electrode, the storage zone and the plurality of migration electrodes, wherein a plurality of series loads are arranged between the migration tube high-voltage power supply board and the plurality of migration electrodes, and the plurality of migration electrodes are sequentially connected with one end of each load.
10. The ion mobility spectrometer of claim 9, wherein: the control board is used for generating periodic positive pulses, periodic negative pulses or periodic positive-zero-negative pulses, and the corona high-voltage power supply board and the migration tube high-voltage power supply board are provided with boosting modules for boosting pulses; the corona high-voltage power supply board further comprises a first selection control module connected with the control board, the first selection control module is used for controlling the on-off of the first power supply module and the second power supply module, the first power supply module is used for providing periodic positive pulses, and the second power supply module is used for providing periodic negative pulses; the transfer tube high-voltage power supply board comprises a third power supply module and a second selection control module connected with the control board, wherein the second selection control module is used for controlling the third power supply module to provide periodic positive pulses, periodic negative pulses or periodic positive-zero-negative pulses.
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