CN111009456A - Ion mobility spectrometry ion receiving device - Google Patents
Ion mobility spectrometry ion receiving device Download PDFInfo
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- CN111009456A CN111009456A CN201911197427.4A CN201911197427A CN111009456A CN 111009456 A CN111009456 A CN 111009456A CN 201911197427 A CN201911197427 A CN 201911197427A CN 111009456 A CN111009456 A CN 111009456A
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- ion
- faraday
- receiving device
- insulating spacer
- mobility spectrometry
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
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- Chemical & Material Sciences (AREA)
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- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
The embodiment of the invention discloses an ion receiving device of an ion mobility spectrometry, which comprises a Faraday disc seat, a Faraday disc, a first insulating spacer with a hole in the middle, an ion grid mesh and a second insulating spacer with a hole in the middle, wherein the Faraday disc seat is provided with a first insulating spacer; the first step structure is arranged on the Faraday disc seat, and the second step structure and the third step structure are arranged on the first insulation spacer, so that the connection structure between the Faraday disc and the Faraday disc seat, between the first insulation spacer and the Faraday disc seat, between the ion grid net and the first insulation spacer, and between the first insulation spacer and the second insulation spacer is simple and convenient to install.
Description
Technical Field
The invention relates to detection equipment for trace detection based on an ion mobility principle, in particular to an ion mobility spectrometry ion receiving device.
Background
Ion Mobility Spectrometry (IMS) is an analytical technique for characterizing chemical ion species based on differences in the mobility velocities of different gas phase ions in the gas phase in an electric field. In ion mobility spectrometry, ion gates are typically used to control the entry of ions from the reflecting region into the drift region. The ion gate is used for injecting ions generated in the reaction region into the drift region in batches. Ions or ion groups entering each time drift to a detector from an ion grid gate, so that under the action of a constant electric field, different drift time can be given by the same drift distance due to different migration frequency coefficients of various ions, and the detection of trace gas is realized.
The ion receiving means is an important component of the detection apparatus based on the ion mobility principle. The traditional ion receiving device adopts independent metal pole pieces to form all components of the device, the pole pieces are separated by insulating materials, and the metal pole pieces are connected with an external cable or discrete divider resistors are welded between the metal pole pieces or the divider resistors are placed outside the receiving device. The ion receiving device has a complex structure and a plurality of leads, and the pole pieces are not easy to detach due to the fact that the pole pieces are mutually welded together through wires or electronic elements.
Therefore, there is a need for an ion receiving device of a new structure to solve the above-mentioned problems.
Disclosure of Invention
In view of the above, the object of the present invention is: the ion receiving device is simple in structure and convenient to install.
In order to achieve one or a part of or all of the above or other objects, the present invention provides an ion mobility spectrometry ion receiving device, comprising a faraday plate base, a faraday plate, a first insulating spacer with a hole in the middle, an ion grid mesh, and a second insulating spacer with a hole in the middle; the middle of the Faraday cup seat is provided with a through first step structure, the Faraday cup is abutted against the first step structure, and the Faraday cup is provided with through holes for air flow to pass through in the circumferential direction; the bottom surface edge indent of first spacer forms the second ladder structure, the top surface edge arch of first spacer forms the third ladder structure, second ladder structure butt is in the Faraday dish with on the Faraday dish seat, the third ladder structure with the ion grid net with the butt of second insulation spacer.
As an improvement of the scheme, as an improvement of the claimed scheme, a boss is arranged in the middle of the Faraday plate, the boss is opposite to the mesh position of the ion grid, and the cross section of the boss is consistent with the area of the mesh of the grid.
As an improvement of the scheme, the boss surface is subjected to mirror polishing treatment, and the surface is provided with a gold-containing coating.
As an improvement of the above scheme, the faraday disk and/or the ion grid are made of stainless steel.
As a further improvement of the above scheme, the bottom case is made of an arabic metal, and is abutted against the faraday tray seat, and a groove is formed in the connection part of the bottom case and the faraday tray seat and used for positioning the faraday tray seat.
As an improvement of the scheme, a sealing groove is further formed in the groove, a sealing ring is arranged in the sealing groove, and the sealing ring is abutted to the bottom surface of the Faraday disc seat.
As an improvement of the above scheme, the faraday plate seat, the faraday plate, the first insulating spacer and the second insulating spacer are covered by an outer shell made of an arabic metal material, and the outer shell is tightly connected with the bottom shell and covers the side parts of the faraday plate seat, the faraday plate, the first insulating spacer and the second insulating spacer.
As an improvement of the above scheme, the inner surface of the outer shell is further provided with a third insulating spacer, and the third insulating spacer is used for isolating the outer shell and parts located inside the outer shell.
As an improvement of the scheme, the second insulating spacer and the shell are simultaneously and tightly connected to the bottom shell through screws.
In an improvement of the above scheme, at least one group of connection structures among the connection structures of the faraday tray seat, the faraday tray, the first insulating spacer, the ion grid mesh and the second insulating spacer are in a step type clamping structure.
The embodiment of the invention has the following beneficial effects:
the first step structure is arranged on the Faraday disc seat, and the second step structure and the third step structure are arranged on the first insulation spacer, so that the connection structure between the Faraday disc and the Faraday disc seat, between the first insulation spacer and the Faraday disc seat, between the ion grid net and the first insulation spacer, and between the first insulation spacer and the second insulation spacer is simple and convenient to install.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, 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 the drawings without creative efforts.
FIG. 1 is a cross-sectional view of one embodiment of an ion receiving device of the present invention;
fig. 2 is a cross-sectional view of another perspective of an ion receiving device according to an embodiment of the present invention.
In the figure: 10-a faraday plate holder; 11-a first step configuration; 20-a faraday disk; 21-a boss; 22-a via hole; 30-first insulating spacer; 31-a second step structure; 32-a third step structure; 40-ion grid; 50-a second insulating spacer; 51-insulating pad boss; 60-a bottom shell; 61-grooves; 62-a seal groove; 63-a sealing ring; 70-a housing; 80-a third insulating spacer; 90-screw; 91-protective tube.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The working principle of the invention is as follows: the gas sample is ionized in the reaction area of the ion migration tube, enters the migration area under the control of the ion grid gate, and the molecular ions migrate to the Faraday disc of the detector under the action of the electric field of the migration area and reach the Faraday disc to form weak current.
Fig. 1 is a cross-sectional view of an embodiment of an ion receiving apparatus of the present invention, and fig. 2 is a cross-sectional view of another view angle of the embodiment of the ion receiving apparatus of the present invention, referring to fig. 1 and fig. 2, the ion receiving apparatus includes a faraday plate holder 10, a faraday plate 20, a first insulating spacer 30 with a central opening, an ion grid 40, and a second insulating spacer 50 with a central opening, a first step structure 11 penetrating through the central portion of the faraday plate holder 10 is disposed, the faraday plate 20 abuts against the first step structure 11, and a diameter of the faraday plate 20 is slightly larger than a size of a clamping position on the first step structure 11, so that the faraday plate 20 can be in interference connection with the first step structure 11, and an operator can conveniently and fixedly connect the faraday plate 20 and the faraday plate holder 10. The faraday plate 20 is provided with through holes 22 for passing air flow in the circumferential direction thereof; the bottom edge of the first insulating spacer 30 is concave to form a second step structure 31, and the top edge of the first insulating spacer 30 is convex to form a third step structure 32; the second stepped structure 31 abuts against the faraday disk 20 and the faraday disk seat 10, so that the second stepped structure 31 is in interference connection with the first stepped structure 11; third ladder structure 32 and ion grid 40 and the insulating spacer of second 50 butts, the size of ion grid 40 slightly is greater than the size of third ladder structure 32 installation position for ion grid 40 is connected with third ladder structure 32 interference, makes things convenient for operating personnel installation operation, and the insulating spacer of second 50 and the junction protrusion of third ladder structure 32 are formed with insulating pad boss 51, and insulating pad boss 51 is connected with third ladder structure 32 interference. As can be seen from the above, the first stepped structure 11, the second stepped structure 31, and the third stepped structure 32 are disposed to facilitate connection operations between the faraday plate 20 and the faraday plate holder 10, between the first insulating spacer 30 and the faraday plate holder 10, between the ion grid 40 and the first insulating spacer 30, and between the second insulating spacer 50 and the first insulating spacer 30. Compared with the traditional structure that the pole pieces are welded together through wires or electronic elements, the pole piece structure is more convenient to install and operate. In actual use, ions to be detected pass through the ion grid 40 via the second insulating spacer 50 to contact the faraday plate 20. It should be noted that, in another embodiment, at least one of the interconnection structures of the faraday plate holder 10, the faraday plate 20, the first insulating spacer 30, the ion grid 40, and the second insulating spacer 50 is a step-type clamping structure, and should also be considered as falling within the protection scope of the present invention.
Preferably, a boss 21 is provided at the middle of the faraday plate 20, the boss 21 is opposite to the mesh position on the ion grid 40, and the cross section of the boss 21 is identical to the mesh area of the ion grid 40. In the transmission process of an electric signal, the distance between the Faraday disc 20 and other metal parts needs to be ensured, the Faraday disc 20 is set to be in a boss structure, the distance between the Faraday disc 20 and the ion grid 40 can be ensured during installation, and a spacing material with good insulating property can be adopted to keep a larger distance with the metal parts when a circuit is accessed, so that the breakdown by high-voltage current is avoided. Since the closer faraday plate 20 is to ion grid 40, the better the signal received by faraday plate 20, it is preferable that faraday plate 20 is spaced from ion grid 40 by 0.3-0.7mm in the embodiment of the present invention.
Preferably, the ion grid 40 is made of stainless steel material with a thickness of 0.2mm, and is used for absorbing induced current and ensuring the reliability of the signal received by the faraday plate 20.
Preferably, the bottom case 60 and the shell 70 are both made of a metal material, the shell 70 is fastened to the bottom case 60, and the shell 70 covers the side portions of the faraday tray seat 10, the faraday tray 20, the first insulating spacer 30 and the second insulating spacer 50, so as to form a shielding case, ensure that ions inside the shielding case are not interfered by external and internal electric fields, and ensure the stability of the ion receiving apparatus. The housing 70 may be formed by processing aluminum in specific applications, which ensures that the housing 70 can be uniformly transferred into the cavity when heated well. At the concave recess 61 that forms in the junction of drain pan 60 and Faraday disc seat 10, recess 61 is used for the location installation Faraday disc seat 10, still be equipped with seal groove 62 in recess 61, be equipped with sealing washer 63 in the seal groove 62, the bottom surface butt of sealing washer 63 and Faraday disc seat 10, the leakproofness of being connected between guarantee drain pan 60 and the Faraday disc seat 10, thereby avoid other organic matters to corrode in getting into Faraday disc seat 10 from the junction of drain pan 60 and Faraday disc seat 10, the accuracy that the interference ion received, sealing washer 63 can be O type sealing washer in the specific use. A third insulating spacer 80 is further disposed on the inner surface of the casing 70, and the third insulating spacer 80 is used for isolating the casing 70 and components located inside the casing 70, so as to ensure insulation between the casing 70 and the components inside the casing. The shell 70 and the third insulating spacer 80 are simultaneously and tightly connected to the bottom shell 60 by a screw 90 penetrating through the shell 70, so that the assembly operation of an operator is facilitated; the third insulating spacer 80 may be made of ultra-thin teflon tape, and the teflon tape is wrapped around the outer surfaces of the faraday tray 10, the faraday tray 20, the first insulating spacer 30, the ion grid 40, and the second insulating spacer 50, so as to prevent the metal element from being too close to the bottom case 60, and to seal the space therebetween. More particularly, the bottom housing 60 may be machined from high strength stainless steel for a particular application.
Preferably, the size of the projection 21 on the faraday plate 20 is slightly smaller than the area of the central through hole of the ion grid 40, so that the faraday plate 20 can receive all ions. The surface of the boss 21 is further subjected to mirror polishing treatment, and the surface of the boss is provided with a gold-containing coating, so that the boss 21 has high sensitivity, and the boss 21 is guaranteed to efficiently receive ions in a gas phase.
Preferably, two pins with standard spacing are led out from both the faraday plate 20 and the ion grid 40, and after the assembly is completed, a socket with double rows of standard spacing is mounted on the metal electrode, so that the connection between the faraday plate 20 and the circuit board is convenient.
Preferably, a protection pipe 91 is further connected to the faraday plate 20 and the ion grid 40, and the protection pipe 91 is made of teflon.
It should be noted that the faraday plate holder 10, the first insulating spacer 30, the second insulating spacer 50, and the third insulating spacer 80 in the embodiment of the present invention are all made of materials with good thermal stability and good insulating property, which ensure the insulating property between the metal parts inside the ion receiving device of the present invention, and specifically may be made of materials such as polyetheretherketone, polytetrafluoroethylene, or ceramics.
The use method of the ion receiving device comprises the following steps: in the using process, high voltage such as 220V commercial power is connected to the ion grid 40, 0V is connected to the Faraday disc 20, impurity-removing airflow flows into the bottom shell 60 from the position A, enters the Faraday disc seat 10, contacts ions entering from the position C through the through holes 22 in the Faraday disc 20, removes impurities, flows into the second insulating spacer 50 from the holes in the ion grid 40, and finally flows out from the position B; the ions pass through the ion grid 40 and are removed, and then contact the faraday plate 20, and weak current is formed on the faraday plate 20.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. An ion receiving device of ion mobility spectrometry is characterized by comprising a Faraday disc seat, a Faraday disc, a first insulating spacer with a hole in the middle, an ion grid mesh and a second insulating spacer with a hole in the middle; the middle of the Faraday cup seat is provided with a through first step structure, the Faraday cup is abutted against the first step structure, and the Faraday cup is provided with through holes for air flow to pass through in the circumferential direction; the bottom surface edge indent of first spacer forms the second ladder structure, the top surface edge arch of first spacer forms the third ladder structure, second ladder structure butt is in the Faraday dish with on the Faraday dish seat, the third ladder structure with the ion grid net with the butt of second insulation spacer.
2. The ion mobility spectrometry ion receiving device according to claim 1, wherein a projection is provided in a central portion of the faraday plate, the projection is located opposite to a mesh of the ion grid, and a cross section of the projection is identical to an area of the mesh of the ion grid.
3. The ion mobility spectrometry ion receiving device according to claim 2, wherein the boss surface is mirror-polished and has a gold-containing coating on the surface.
4. The ion mobility spectrometry ion receiving device of claim 2, wherein the faraday plate and/or the ion grid are stainless steel.
5. The ion mobility spectrometry ion receiving device according to any one of claims 1 to 4, further comprising a bottom case made of a metal material, wherein the bottom case abuts against the Faraday cup, and a groove is recessed in a joint of the bottom case and the Faraday cup, and the groove is used for positioning the Faraday cup.
6. The ion mobility spectrometry ion receiving device of claim 5, wherein the recess further comprises a sealing groove, the sealing groove is internally provided with a sealing ring, and the sealing ring abuts against the bottom surface of the Faraday disc seat.
7. The ion mobility spectrometry ion receiving device of claim 5, further comprising a metal housing, wherein the metal housing is fastened to the bottom shell, and the metal housing covers the sides of the faraday tray, the first insulating spacer, and the second insulating spacer.
8. The ion mobility spectrometry ion receiving device of claim 7, wherein the inner surface of the housing is further provided with a third insulating spacer for isolating the housing and components located therein.
9. The ion mobility spectrometry ion receiving device of claim 7, wherein the second insulating spacer and the housing are simultaneously fastened to the bottom case by screws.
10. The ion mobility spectrometry ion receiving device of claim 5, wherein at least one of the connection structures of the Faraday cup, the first insulating spacer, the ion grid mesh, and the second insulating spacer is a stepped clamping structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911197427.4A CN111009456A (en) | 2019-11-29 | 2019-11-29 | Ion mobility spectrometry ion receiving device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911197427.4A CN111009456A (en) | 2019-11-29 | 2019-11-29 | Ion mobility spectrometry ion receiving device |
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| CN111009456A true CN111009456A (en) | 2020-04-14 |
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| CN201911197427.4A Pending CN111009456A (en) | 2019-11-29 | 2019-11-29 | Ion mobility spectrometry ion receiving device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112381304A (en) * | 2020-11-19 | 2021-02-19 | 陈志� | Planning operation system of electric power system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209388998U (en) * | 2019-02-26 | 2019-09-13 | 深圳市沛泓电子有限公司 | The ion reception device of ion mobility spectrometry |
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- 2019-11-29 CN CN201911197427.4A patent/CN111009456A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209388998U (en) * | 2019-02-26 | 2019-09-13 | 深圳市沛泓电子有限公司 | The ion reception device of ion mobility spectrometry |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112381304A (en) * | 2020-11-19 | 2021-02-19 | 陈志� | Planning operation system of electric power system |
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Application publication date: 20200414 |