Ion migration tube

Abstract

The utility model provides an ion migration tube to solve the problem of how to improve the ionization effect of an ion migration tube using an ultraviolet lamp type ionization source on substances. The ion migration tube provided by the utility model comprises a sample introduction piece, an ionization assembly, an ion gate assembly, a migration assembly and an ion receiver, the sample introduction piece is provided with a sample introduction port; the ionization assembly comprises a base body and at least two ultraviolet lamps connected to the base body, the base body is provided with an ionization area, the sample inlet is communicated with the ionization area, and the at least two ultraviolet lamps are circumferentially distributed on the periphery of the ionization area; the migration assembly is provided with a migration area, the ion gate assembly is arranged between the ionization area and the migration area, and the ion receiver is arranged on the side, away from the ion gate assembly, of the migration area.

Description

An ion migration tube Technical Field

[0001] This utility model relates to the field of ion mobility spectroscopy technology, and in particular to an ion mobility tube. Background Technology

[0002] With societal development, the demand for the detection of explosives and other hazardous materials is becoming increasingly important. Explosive detection devices based on ion mobility spectrometry (IMS) technology are widely used due to their advantages such as portability, speed, and sensitivity. Therefore, explosive detection devices generally include an ion migration tube, which contains an ionization source. Ionization sources come in various types based on their implementation principles, one of which is the ultraviolet lamp ionization source.

[0003] However, for the existing ion migration tube structure of ultraviolet lamp type ionization sources, the sample gas is input into the ionization region of the ion migration tube through the inlet of the ion migration tube, and the sample gas is ionized by ultraviolet lamp irradiation. As the time goes on, the energy of the photons emitted by the ultraviolet lamp will be lost, resulting in insufficient ionization of the material. Summary of the Invention

[0004] This invention provides an ion migration tube to address the problem of how to improve the ionization effect of an ion migration tube using an ultraviolet lamp-type ionization source on substances.

[0005] To solve the above-mentioned technical problems, this utility model is implemented as follows:

[0006] The ion migration tube provided in this embodiment of the present invention includes: a sample injection element, an ionization component, an ion gate component, a migration component, and an ion receiver; the sample injection element is provided with an inlet; the ionization component includes a substrate and at least two ultraviolet lamps connected to the substrate, the substrate is provided with an ionization region, the inlet is connected to the ionization region, and the at least two ultraviolet lamps are circumferentially distributed around the outer periphery of the ionization region; the migration component is provided with a migration region, the ion gate component is located between the ionization region and the migration region, and the ion receiver is located on the side of the migration region away from the ion gate component.

[0007] In some embodiments, each of the ultraviolet lamps is evenly distributed circumferentially along the ionization region, and the light-emitting part of each ultraviolet lamp faces the ionization region.

[0008] In some embodiments, the substrate is provided with a first through hole, one side of which is connected to the sample inlet and the other side is connected to the migration region; the substrate is also provided with at least two second through holes evenly distributed along the circumference of the first through hole, each second through hole penetrating the outer surface of the substrate from the hole wall of the second through hole, and the ultraviolet lamps are correspondingly disposed in the second through holes, and the light-emitting part of each ultraviolet lamp is facing the ionization region located in the first through hole.

[0009] In some embodiments, the ion migration tube further includes a first electrode and a second electrode, wherein the first electrode is disposed on the side of the ionization region away from the ion gate assembly, and the second electrode is disposed on the side of the ionization region away from the injection port.

[0010] In some embodiments, the second electrode is provided with a groove recessed toward the first electrode, the bottom of the groove is provided with a third through hole, and the opening of the circumferential sidewall of the groove gradually increases in the direction from the bottom of the groove toward the ion gate assembly.

[0011] In some embodiments, the ion gate assembly includes a third electrode and a fourth electrode spaced apart.

[0012] In some embodiments, the ion gate assembly further includes an isolation ring disposed between the third electrode and the fourth electrode.

[0013] In some embodiments, the third electrode is a first ion-gate grid, the first ion-gate grid including a first metal wire, and the fourth electrode is a second ion-gate grid, the second ion-gate grid including a second metal wire; the third electrode is positioned and engaged with the isolation ring, and the fourth electrode is positioned and engaged with the isolation ring.

[0014] In some embodiments, one of the third electrode and the isolation ring is provided with a first positioning hole, and the other is provided with a first positioning post, wherein the first positioning post is positioned and engaged with the first positioning hole; one of the fourth electrode and the isolation ring is provided with a second positioning hole, and the other is provided with a second positioning post, wherein the second positioning post is positioned and engaged with the second positioning hole.

[0015] In some embodiments, the migration assembly includes a resistive tube, a fifth electrode, and a sixth electrode. The resistive tube forms the migration region. The fifth electrode is located on the side of the migration region away from the ion receiver and is electrically connected to the end of the resistive tube away from the ion receiver. The sixth electrode is located between the migration region and the ion receiver and is electrically connected to the end of the resistive tube facing the ion receiver.

[0016] In some embodiments, the resistor tube has a spiral wire inside.

[0017] In some embodiments, the ion receiver includes a Faraday disk.

[0018] In some embodiments, the ion migration tube is provided with a circulating gas inlet and an outlet, the circulating gas inlet being connected to the migration region and the outlet being connected to the ionization region.

[0019] The above-mentioned technical solutions adopted in the embodiments of this utility model can achieve the following beneficial effects:

[0020] In the embodiments of this utility model, since the ionization component includes at least two ultraviolet lamps, and the at least two ultraviolet lamps are circumferentially distributed around the outer periphery of the ionization region, when the sample gas enters the ionization region, the sample gas is exactly in the area that can be irradiated by multiple ultraviolet lamps. This can better improve the utilization rate of materials and improve the ionization efficiency, thereby making the ionization of the sample gas by the ionization component more complete.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 is a schematic diagram of an ion migration tube provided in an embodiment of the present invention;

[0024] Figure 2 is a cross-sectional view of an ion migration tube provided in an embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of an ionization component provided in an embodiment of the present invention;

[0026] Figure 4 is a left view of the ionization assembly shown in Figure 3;

[0027] Figure 5 is a schematic diagram of a first electrode provided in an embodiment of the present invention;

[0028] Figure 6 is a cross-sectional view of the first electrode shown in Figure 5;

[0029] Figure 7 is a schematic diagram of a second electrode provided in an embodiment of the present invention;

[0030] Figure 8 is a cross-sectional view of the second electrode shown in Figure 7;

[0031] Figure 9 is a schematic diagram of a third electrode provided in an embodiment of the present invention;

[0032] Figure 10 is a schematic diagram of the third electrode from another angle, as shown in Figure 9;

[0033] Figure 11 is a schematic diagram of a fourth electrode provided in an embodiment of the present invention;

[0034] Figure 12 is a schematic diagram of the fourth electrode from another angle as shown in Figure 11;

[0035] Figure 13 is a schematic diagram of an isolation ring provided in an embodiment of the present invention;

[0036] Figure 14 is a schematic diagram of the isolation ring shown in Figure 13 from another angle;

[0037] Figure 15 is a schematic diagram of the isolation ring shown in Figure 13 at another angle;

[0038] Figure 16 is a schematic diagram of a resistor provided in an embodiment of the present invention;

[0039] Figure 17 is a cross-sectional view of the resistor tube shown in Figure 16.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1-Ion migration tube;

[0042] 100 - Injector; 110 - Injector port;

[0043] 200 - Ionization component; 210 - Substrate; 211 - Ionization region; 212 - First through hole; 213 - Second through hole; 220 - Ultraviolet lamp; 230 - First electrode; 240 - Second electrode; 241 - Groove; 242 - Third through hole;

[0044] 300 - Ion gate assembly; 310 - Third electrode; 311 - First positioning hole; 320 - Fourth electrode; 321 - Second positioning hole; 330 - Isolation ring; 331 - First positioning post; 332 - Second positioning post;

[0045] 400 - Migration component; 410 - Migration region; 420 - Resistor; 421 - Spiral; 430 - Fifth electrode; 440 - Sixth electrode;

[0046] 500-ion receiver;

[0047] 610 - Circulating air inlet; 620 - Air outlet;

[0048] 700 - Housing. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0050] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0051] Furthermore, although the terminology used in this invention is selected from commonly known and used terms, some terms mentioned in this specification may have been selected by the applicant in his or her judgment, and their detailed meanings are explained in the relevant sections of the description herein.

[0052] Furthermore, it is required that this utility model be understood not only through the actual terminology used, but also through the meaning implied by each term.

[0053] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0054] This utility model provides an ion migration tube. Referring to Figures 1 to 17, the ion migration tube 1 provided in this utility model includes: a sample injection element 100, an ionization component 200, an ion gate component 300, a migration component 400, and an ion receiver 500.

[0055] The sample inlet 100 is provided with an inlet 110. The sample gas can be delivered to the ion migration tube 1 for detection through the inlet 110. It should be noted that the sample gas can also be referred to as the gas to be detected.

[0056] The ionization assembly 200 includes a substrate 210 and at least two ultraviolet lamps 220 connected to the substrate 210. The substrate 210 has an ionization region 211, and the sample inlet 110 is connected to the ionization region 211. The at least two ultraviolet lamps 220 are circumferentially distributed around the outer periphery of the ionization region 211.

[0057] For example, the ionization component 200 includes two ultraviolet lamps 220, which are circumferentially distributed around the outer periphery of the ionization region 211. For instance, the two ultraviolet lamps 220 are arranged opposite each other. For example, the ionization component 200 includes three ultraviolet lamps 220, which are circumferentially distributed around the outer periphery of the ionization region 211. For example, the ionization component 200 includes four ultraviolet lamps 220, which are circumferentially distributed around the outer periphery of the ionization region 211. In this way, the photon emission regions of the multiple ultraviolet lamps 220 coincide and focus at the central axis of the ionization region 211, improving the ionization capability of the ionization region 211. When sample gas enters the ionization region 211, the sample gas is precisely in the area irradiated by the multiple ultraviolet lamps 220, thus better improving material utilization and ionization efficiency.

[0058] The migration component 400 has a migration region 410, the ion gate component 300 is located between the ionization region 211 and the migration region 410, and the ion receiver 500 is located on the side of the migration region 410 away from the ion gate component 300.

[0059] In this way, in the embodiments of this utility model, since the ionization component 200 includes at least two ultraviolet lamps 220, and the at least two ultraviolet lamps 220 are circumferentially distributed around the outer periphery of the ionization region 211, when the sample gas enters the ionization region 211, the sample gas is exactly in the area that can be irradiated by multiple ultraviolet lamps 220. This can better improve the material utilization rate and ionization efficiency, thereby making the ionization component 200 more fully ionize the sample gas.

[0060] Referring to Figure 2, in some embodiments, the side of the inlet 110 facing away from the ionization region 211 is provided with a conical surface. The inlet 110 passes through the central region of the conical surface. The opening of the conical surface gradually increases in the direction facing away from the ionization region 211. In other words, taking the orientation shown in Figure 2 as an example, the opening of the conical surface gradually increases in the direction from right to left. In this way, by setting the conical surface, the sample gas can enter the ionization region 211 more effectively through the inlet 110.

[0061] In some embodiments, the sample inlet 110 is coaxially connected to the ionization region 211. At least two ultraviolet lamps 220 are circumferentially and evenly distributed around the outer periphery of the ionization region 211 relative to its central axis. This ensures that the photon emission areas of the multiple ultraviolet lamps 220 are focused on the central axis of the ionization region 211, thereby improving its ionization capability. When the sample gas enters the ionization region 211, it is positioned within the area irradiated by all the ultraviolet lamps 220, further enhancing material utilization and ionization efficiency.

[0062] In some embodiments, each ultraviolet lamp 220 is evenly distributed circumferentially along the circumference of the ionization region 211, and the light-emitting part of each ultraviolet lamp 220 is facing the ionization region 211.

[0063] Furthermore, in some embodiments, the substrate 210 is provided with a first through hole 212, one side of which communicates with the sample inlet 110 and the other side with the migration region 410. The substrate 210 is also provided with at least two second through holes 213 evenly distributed circumferentially along the first through hole 212. Each second through hole 213 penetrates the outer surface of the substrate 210 through its hole wall. Ultraviolet lamps 220 are correspondingly disposed in the second through holes 213, and the light-emitting part of each ultraviolet lamp 220 faces the ionization region 211 located in the first through hole 212.

[0064] For example, the substrate 210 has two first through holes 212, and the number of ultraviolet lamps 220 is two, with each ultraviolet lamp 220 correspondingly disposed in a second through hole 213. Alternatively, the substrate 210 has three first through holes 212, and the number of ultraviolet lamps 220 is three, with each ultraviolet lamp 220 correspondingly disposed in a second through hole 213. Further examples are not listed here.

[0065] In this way, by having at least two ultraviolet lamps 220 evenly distributed circumferentially along the ionization region 211 and facing towards the ionization region 211, the photon emission regions of each ultraviolet lamp 220 in the ion migration tube 1 are aligned and focused at the central axis of the first through-hole 212, thereby improving the ionization capability of the ionization region 211. When the sample gas enters the ionization region 211, the sample gas is precisely within the area irradiated by all ultraviolet lamps 220, which can better improve the material utilization rate, increase ionization efficiency, and enhance the ionization effect.

[0066] Referring to Figure 2, in some embodiments, the ion migration tube 1 further includes a first electrode 230 and a second electrode 240. The first electrode 230 is disposed on the side of the ionization region 211 away from the ion gate assembly 300, and the second electrode 240 is disposed on the side of the ionization region 211 away from the sample inlet 110.

[0067] Taking the orientation shown in Figure 2 as an example, the ionization region 211 is horizontally positioned, with the first electrode 230 located to the left of the ionization region 211 and the second electrode 240 located to the right of the ionization region 211. Thus, when a first voltage signal is supplied to the first electrode 230 and a second voltage signal is supplied to the second electrode 240, and the voltage of the first voltage signal is higher than the voltage of the second voltage signal, the ions generated by the ionization of the sample gas in the ionization region 211 move from the first electrode 230 towards the second electrode 240 under the influence of the electric field between the first electrode 230 and the second electrode 240.

[0068] Referring to Figures 2, 7, and 8, in some embodiments, the second electrode 240 is provided with a groove 241 recessed towards the first electrode 230. A third through hole 242 is provided at the bottom of the groove 241. The opening of the circumferential sidewall of the groove 241 gradually increases in the direction from the bottom of the groove 241 towards the ion gate assembly 300. This allows the groove 241 to be funnel-shaped, thus the smaller diameter of the second electrode 240 facilitates the formation of a dense electric field, which in turn facilitates the rapid entry of ions into the storage area between the second electrode 240 and the ion gate assembly 300 for storage.

[0069] It should be noted that the second electrode 240 can be referred to as the guiding electrode. In the embodiments of this utility model, by using the guiding electrode as the storage electrode, ionized ions are rapidly introduced into the storage region and stored. When the ion gate formed by the ion gate assembly 300 is opened, more sample ions can pass through the ion gate and enter the migration region 410.

[0070] Referring to Figures 2, 9 to 15, in some embodiments, the ion gate assembly 300 includes a third electrode 310 and a fourth electrode 320 spaced apart. When a third voltage signal is supplied to the third electrode 310 and a fourth voltage signal is supplied to the fourth electrode 320, and the voltage of the third voltage signal is higher than the voltage of the fourth voltage signal, the ion gate formed by the ion gate assembly 300 is in an open state, and ions move from the third electrode 310 towards the fourth electrode 320 under the influence of the electric field between the third electrode 310 and the fourth electrode 320. When the voltage of the third voltage signal is lower than the voltage of the fourth voltage signal, the ion gate formed by the ion gate assembly 300 is in a closed state, and ions are stored in the storage region between the second electrode 240 and the third electrode 310.

[0071] In some embodiments, the ion gate assembly 300 further includes an isolation ring 330 disposed between the third electrode 310 and the fourth electrode 320. The isolation ring 330 is made of an insulating material. The isolation ring 330 is used to prevent a short circuit between the third electrode 310 and the fourth electrode 320 due to accidental short circuit.

[0072] In some embodiments, the third electrode 310 is a first ion-gate grid, which includes a first metal wire. The fourth electrode 320 is a second ion-gate grid, which includes a second metal wire. The third electrode 310 and the fourth electrode 320 are positioned and engaged with the isolation ring 330. This ensures that the first and second metal wires are parallel and concentric.

[0073] In some embodiments, one of the third electrode 310 and the isolation ring 330 is provided with a first positioning hole 311, and the other is provided with a first positioning post 331, the first positioning post 331 being positioned and engaged with the first positioning hole 311. One of the fourth electrode 320 and the isolation ring 330 is provided with a second positioning hole 321, and the other is provided with a second positioning post 332, the second positioning post 332 being positioned and engaged with the second positioning hole 321.

[0074] Referring, as exemplarily to Figures 12 to 15, in some embodiments, the third electrode 310 is provided with a first positioning hole 311, and the isolation ring 330 is provided with a first positioning post 331. The first positioning post 331 is used for positioning and engaging with the first positioning hole 311. The fourth electrode 320 is provided with a second positioning hole 321, and the isolation ring 330 is provided with a second positioning post 332, which is used for positioning and engaging with the second positioning hole 321. In this way, the third electrode 310 is positioned and engaged with the fourth electrode 320 via the isolation ring 330 to avoid misalignment between the first and second metal wires, which would affect the movement of ions and prevent ion loss.

[0075] In some embodiments, the migration assembly 400 includes a resistor tube 420, a fifth electrode 430, and a sixth electrode 440. Exemplarily, the resistor tube 420 has a spiral 421 inside. In an optional embodiment, the aforementioned resistor tube 420 may be a one-piece cylindrical resistor tube integrally formed during manufacturing. The resistor tube 420 surrounds a migration region 410. The fifth electrode 430 is located on the side of the migration region 410 facing away from the ion receiver 500 and is electrically connected to the end of the resistor tube 420 facing away from the ion receiver 500. The sixth electrode 440 is located between the migration region 410 and the ion receiver 500 and is electrically connected to the end of the resistor tube 420 facing the ion receiver 500.

[0076] It should be noted that a fifth voltage signal can be transmitted to one end of the resistor tube 420 via the fifth electrode 430, and a sixth voltage signal can be transmitted to the other end of the resistor tube 420 via the sixth electrode 440. The voltage of the fifth voltage signal is higher than that of the sixth voltage signal. The voltage intensity of the fifth voltage signal is reduced more uniformly to the voltage intensity of the sixth voltage signal through the resistor tube 420, thereby making the electric field in the migration region 410 more uniform. Therefore, ions can be better separated in the migration region 410.

[0077] In other embodiments, the migration component 400 may include a plurality of insulating rings and metal rings arranged alternately in sequence. Exemplarily, the alternation of the metal rings and insulating rings is as follows: metal ring, insulating ring, metal ring-insulating ring, ..., insulating ring and metal ring. The inner regions of the alternately arranged insulating rings and metal rings form a migration region 410. At the functional implementation level of the migration component, the plurality of alternately arranged insulating rings and metal rings can perform essentially the same function as the aforementioned resistor 420, each with its own characteristics, and can be reasonably selected according to requirements.

[0078] It is understandable that, compared with the scheme in which multiple alternating insulating rings and metal rings are arranged sequentially to form the migration region 410, the scheme in which the resistance tube 420 forms the migration region 410 does not require splicing of the insulating rings and metal rings. Therefore, the ion migration tube 1 using the scheme in which the resistance tube 420 forms the migration region 410 has the characteristic of being easy to assemble.

[0079] In this way, by replacing multiple pairs of spaced insulating rings and metal rings with the aforementioned resistor tube 420, the installation speed of the migration component 400 is improved, and it also features high precision and makes it easier to form a uniform electric field. It should be noted that the resistor tube 420 has a continuous spiral line cut into its inner wall to achieve the voltage division effect; the smaller the lead, the smaller the voltage division resistance and the more uniform the electric field.

[0080] In some embodiments, the ion receiver 500 includes a Faraday disk. Ions bombarding the Faraday disk generate electrical signals. Thus, the detection device can analyze the sample gas based on these electrical signals.

[0081] In some embodiments, the ion migration tube 1 is provided with a circulating gas inlet 610 and an outlet 620. The circulating gas inlet 610 is connected to the migration zone 410, and the outlet 620 is connected to the ionization zone 211. The circulating gas inlet 610 and the outlet 620 can be connected to a gas circulation device. The gas circulation device allows circulating gas to enter the migration zone 410 through the circulating gas inlet 610 and then exit the ion migration tube 1 through the outlet 620. In addition, the gas circulation device may be provided with a purifier to remove impurities from the circulating gas.

[0082] In some embodiments, the ion migration tube 1 further includes a housing 700. The housing 700 covers the ionization assembly 200, the ion gate assembly 300, the migration assembly 400 and the ion receiver 500, and the sample injector 100 is sealed at the end of the housing 700.

[0083] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0084] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ion migration tube, characterized in that, include: The sample injector (100), ionization assembly (200), ion gate assembly (300), migration assembly (400), and ion receiver (500) are provided. The sample injector (100) is provided with an inlet (110). The ionization assembly (200) includes a substrate (210) and at least two ultraviolet lamps (220) connected to the substrate (210). The substrate (210) is provided with an ionization region (211). The inlet (110) is connected to the ionization region (211). The at least two ultraviolet lamps (220) are circumferentially distributed around the outer periphery of the ionization region (211). The migration assembly (400) is provided with a migration region (410). The ion gate assembly (300) is located between the ionization region (211) and the migration region (410). The ion receiver (500) is located on the side of the migration region (410) away from the ion gate assembly (300).

2. The ion migration tube according to claim 1, characterized in that, Each of the ultraviolet lamps (220) is evenly distributed in a circle along the circumference of the ionization region (211), and the light-emitting part of each of the ultraviolet lamps (220) is facing the ionization region (211).

3. The ion migration tube according to claim 2, characterized in that, The substrate (210) is provided with a first through hole (212), one side of the first through hole (212) is connected to the sample inlet (110), and the other side is connected to the migration region (410); the substrate (210) is also provided with at least two second through holes (213) evenly distributed along the circumference of the first through hole (212), each second through hole (213) penetrates through the hole wall of the second through hole (213) through the outer surface of the substrate (210), the ultraviolet lamps (220) are correspondingly provided in the second through holes (213), and the light-emitting part of each ultraviolet lamp (220) is facing the ionization region (211) located in the first through hole (212).

4. The ion migration tube according to claim 1, characterized in that, The ion migration tube further includes a first electrode (230) and a second electrode (240), wherein the first electrode (230) is located on the side of the ionization region (211) away from the ion gate assembly (300), and the second electrode (240) is located on the side of the ionization region (211) away from the injection port (110).

5. The ion migration tube according to claim 4, characterized in that, The second electrode (240) is provided with a groove (241) recessed toward the first electrode (230), and the bottom of the groove (241) is provided with a third through hole (242). In the direction from the bottom of the groove (241) toward the ion gate assembly (300), the opening of the circumferential sidewall of the groove (241) gradually increases.

6. The ion migration tube according to claim 1, characterized in that, The ion gate assembly (300) includes a third electrode (310), a fourth electrode (320), and an isolation ring (330) spaced apart. The isolation ring (330) is disposed between the third electrode (310) and the fourth electrode (320). The third electrode (310) is a first ion gate grid, which includes a first metal wire. The fourth electrode (320) is a second ion gate grid, which includes a second metal wire. The third electrode (310) is positioned and connected to the isolation ring (330), and the fourth electrode (320) is positioned and connected to the isolation ring (330).

7. The ion migration tube according to claim 6, characterized in that, One of the third electrode (310) and the isolation ring (330) is provided with a first positioning hole (311), and the other is provided with a first positioning post (331). The first positioning post (331) is positioned and connected with the first positioning hole (311). One of the fourth electrode (320) and the isolation ring (330) is provided with a second positioning hole (321), and the other is provided with a second positioning post (332). The second positioning post (332) is positioned and connected with the second positioning hole (321).

8. The ion migration tube according to claim 1, characterized in that, The migration assembly (400) includes a resistor (420), a fifth electrode (430), and a sixth electrode (440). The resistor (420) forms the migration region (410). The fifth electrode (430) is located on the side of the migration region (410) away from the ion receiver (500) and is electrically connected to the end of the resistor (420) away from the ion receiver (500). The sixth electrode (440) is located between the migration region (410) and the ion receiver (500) and is electrically connected to the end of the resistor (420) facing the ion receiver (500).

9. The ion migration tube according to claim 8, characterized in that, The resistor tube (420) has a spiral (421) inside.

10. The ion migration tube according to claim 1, characterized in that, The ion migration tube is provided with a circulating gas inlet (610) and an outlet (620). The circulating gas inlet (610) is connected to the migration zone (410), and the outlet (620) is connected to the ionization zone (211).

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