An ion migration tube composed of PCB boards

Abstract

The invention discloses an ion migration tube composed of PCB boards, which is composed of 6 PCB boards and 3 grids. All functions of the migration tube are integrated in the PCB board, and the integration is extremely high. Except for the grid, all components constituting the ion migration tube are PCB boards, which reduces the production cost. By utilizing electronic high-precision manufacturing technology, the design efficiency and processing accuracy are improved, and it is convenient for laboratory production or batch production. The ion migration tube is small in size and is particularly suitable for use in wearable or portable instruments.

Description

Technical Field

[0001] The invention relates to an ion transfer tube, in particular to an ion transfer tube composed of a PCB board, which is particularly suitable for application in wearable or portable instruments. Background Art

[0002] Ion mobility spectrometry (IMS) refers to a device that uses the principle and method of identifying chemicals by their mobility in the gas phase. As a separator and detector for ion mobility spectrometry samples, the design structure and performance of the ion migration tube directly determine the size and performance indicators of the instrument. There are various designs of ion migration tubes, and the sizes and shapes vary greatly. Most traditional ion migration tubes are designed in a cylindrical shape with multiple electrode rings stacked. Some of the electrode rings are fixed with sleeves, while others are extruded with screw columns. They all involve a large number of machined parts, and the cost will be very high. The electrode rings are also affected by the machining accuracy, which affects the performance of the instrument. The assembly of ion migration tubes has high technical requirements for personnel. Affected by insulation and sealing, the size of the migration tube is large. It is not conducive to the miniaturization of the instrument, especially wearable instruments.

[0003] Using high-precision processing technology in electronics manufacturing, an ion migration tube can be designed using a printed circuit board (PCB board). The migration tubes designed using PCB boards include: Patents CN201820610642.7, 202011458384.3, 201811381274.4 and 201811001917.8. The migration tube designed by patent CN201820610642.7 replaces the stacked electrode rings with PCB boards, and also has some defects of traditional ion migration tubes. Patent 202011458384.3 only designs a component of the migration tube using PCB boards. The migration tubes designed by patents 201811001917.8 and 201811381274.4 only have a small part of the PCB board, and also involve a large number of machined parts.

[0004] The present invention provides an ion migration tube composed of a PCB board, which has a simplified structure, reduced machined parts to an extreme (except for a grid), and a very small volume. According to the principle of ion migration spectrometry, the ion migration tube composed of the PCB board also includes an ionization source, a reaction zone, an ion gate, a migration zone, a grid and a Faraday disk, which are integrated into an organic whole. The migration tube has a simple structure and a very low cost, can be used on board or independently, and is particularly suitable for use in wearable or portable instruments due to its small volume. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an ion migration tube composed of a PCB board, thereby achieving the technical problems of high integration, small size and low cost.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] An ion migration tube composed of PCB boards, comprising a front PCB board, a rear PCB board, an upper PCB board, a lower PCB board, a right PCB board and a left PCB board forming a rectangular cylinder, and a TP ion gate formed by two grids from front to back and a Faraday disk shielding grid formed by one grid arranged inside the rectangular cylinder;

[0008] The front PCB board has a circular hole in the center as a carrier gas port; copper foil as a repelling electrode is laid around the circular hole;

[0009] A circular copper foil is laid at the center of the front of the rear PCB board as a Faraday disk; a ring-shaped ground electrode is laid concentrically and spaced apart from the Faraday disk; a circular hole is laid at the upper center as a floating air outlet; a signal connector is welded at the center of the rear of the rear PCB board to facilitate signal extraction;

[0010] A reaction zone is formed in front of the TP ion gate; a migration zone is formed between the TP ion gate and the Faraday disk shielding grid;

[0011] The upper PCB board, the lower PCB board, the right PCB board and the left PCB board inside the reaction zone and the migration zone are respectively provided with electrode strips; the upper PCB board outside the reaction zone and the migration zone is respectively provided with electrode strips, and the electrode strips inside and outside the upper PCB board of the reaction zone and the migration zone are provided with voltage divider resistors;

[0012] On the right PCB board between the electrode strip in the reaction area and the TP ion gate, a circular hole is provided as a gas outlet;

[0013] The grid is a stainless steel sheet with a rectangular structure and a mesh in the middle;

[0014] A rectangular tooth of the grid is respectively arranged at the center of the four sides of the grid.

[0015] Furthermore, in the above technical solution, the front PCB board, the rear PCB board, the upper PCB board, the lower PCB board, the right PCB board and the left PCB board are rectangular structure PCB boards with sawtooth-shaped edges; the sawtooths of the front PCB board and the rear PCB board can be coupled with the sawtooths of the upper PCB board, the lower PCB board, the right PCB board and the left PCB board respectively; the sawtooths of the upper PCB board and the lower PCB board can be coupled with the sawtooths of the right PCB board and the left PCB board respectively.

[0016] Further, in the above technical solution, two ion gate positioning holes are respectively provided on the upper PCB board, the lower PCB board, the right PCB board and the left PCB board; the ion gate positioning holes can be coupled with the rectangular teeth of the two grids and fix the grids to form a TP ion gate;

[0017] The upper PCB board, the lower PCB board, the right PCB board and the left PCB board are respectively provided with grid positioning holes; the grid positioning holes can be coupled with the grid rectangular teeth of a grid and fix the grid to form a shielding grid of the Faraday disk.

[0018] Furthermore, in the above technical solution, the teeth and grooves of the sawtooth of the front PCB board, the rear PCB board, the upper PCB board, the lower PCB board, the right PCB board and the left PCB board may be rectangular, triangular or trapezoidal.

[0019] Furthermore, in the above technical solution, the electrode strips of the upper PCB board, the lower PCB board, the right PCB board and the left PCB board are electrically connected to each other at the same position, and the voltage is divided by the voltage-dividing resistor to form the electric field required by the ion migration tube.

[0020] Furthermore, in the above technical solution, the copper foil electrode is welded to a ring-shaped radioactive ionization source or the copper foil electrode is connected to an external ionization source.

[0021] Furthermore, in the above technical solution, the ionization source is a VUV lamp, corona discharge or laser analysis.

[0022] Furthermore, in the above technical solution, the grid is processed by laser etching or metal mesh processing.

[0023] Furthermore, in the above technical solution, the surfaces of the repulsive electrodes, reaction zone electrode strips, migration zone electrodes, Faraday disks and ground electrodes of the front PCB board, rear PCB board, upper PCB board, lower PCB board, right PCB board and left PCB board are gold-plated or tin-plated.

[0024] Beneficial Effects

[0025] (1) The ion transfer tube composed of PCB boards provided by the present invention utilizes electronic high-precision manufacturing technology to design and produce the components required for the ion transfer tube. This improves design efficiency and processing accuracy. Except for the grid, all components that make up the ion transfer tube are PCB boards, which simplifies the system of the ion transfer tube, greatly reduces production costs, and is convenient for laboratory production or mass production.

[0026] (2) The ion migration tube composed of the PCB board provided by the present invention is the same as the traditional ion migration tube. The required functions such as electrodes, voltage division, signal reception, insulation and shielding are all integrated in the PCB board, and the integration level is extremely high. Some required circuits can also be integrated into the PCB board as needed to further improve the integration level of the ion migration spectrometer, which is particularly suitable for use in wearable or portable instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1The schematic diagram of the overall structure of the ion migration tube composed of PCB board;

[0028] Figure 2 This is a schematic diagram of the front PCB board structure;

[0029] Figure 3 This is a schematic diagram of the right PCB board structure;

[0030] Figure 4 It is a schematic diagram of the upper PCB board structure;

[0031] Figure 5 This is a schematic diagram of the rear PCB board structure;

[0032] Figure 6 Schematic diagram of the grid structure.

[0033] Figure 7 Negative ion RIP signal of ion mobility spectrometry measured by ion migration tube composed of PCB board

[0034] In the figure, 1 is the front PCB board; 2. the right PCB board; 3. the air outlet; 4. the voltage-dividing resistor; 5. the upper PCB board; 6. the rectangular teeth of the grid; 7. the rear PCB board; 8. the signal connector; 9. the floating air outlet; 10. the teeth; 11. the carrier gas outlet; 12. the radioactive ionization source; 13. the repelling electrode; 14. the electrode strip in the reaction zone; 15. the ion gate positioning hole; 16. the electrode strip in the migration zone; 17. the grid positioning hole; 18. the Faraday disk; 19. the ground electrode; 20. the grid. DETAILED DESCRIPTION

[0035] The present invention provides an ion migration tube composed of a PCB board, and the present invention is further described in detail below in conjunction with the accompanying drawings.

[0036] Example 1

[0037] An ion migration tube composed of PCB boards, comprising a front PCB board 1, a rear PCB board 7, an upper PCB board 5, a lower PCB board, a right PCB board 2 and a left PCB board each forming a rectangular cylinder, and a TP ion gate formed by two grids from front to back and a Faraday disk shielding grid formed by one grid arranged inside the rectangular cylinder;

[0038] The front PCB board 1 has a circular hole in the center as a carrier gas port 11; copper foil as a repelling electrode is laid around the circular hole;

[0039] A circular copper foil is laid at the center of the front of the rear PCB board 7 as a Faraday disk 18; a circular ground electrode 19 is laid concentrically and spaced from the Faraday disk; a circular hole is laid at the upper center as a floating air port 9; a signal connector 8 is welded at the center of the rear of the rear PCB board 7;

[0040] A reaction zone is formed in front of the TP ion gate; a migration zone is formed between the TP ion gate and the Faraday disk shielding grid;

[0041] Electrode strips are respectively arranged on the upper PCB board 5, the lower PCB board, the right PCB board 2 and the left PCB board inside the reaction zone and the migration zone; electrode strips are respectively arranged on the upper PCB board 5 outside the reaction zone and the migration zone, and voltage divider resistors 4 are arranged on the electrode strips inside and outside the upper PCB board 5 of the reaction zone and the migration zone;

[0042] A circular hole is provided on the right PCB board 2 between the reaction zone electrode strip and the TP ion gate, serving as a gas outlet 3;

[0043] The grid is a stainless steel sheet with a rectangular structure and a mesh in the middle;

[0044] A rectangular tooth of the grid is respectively arranged at the center of the four sides of the grid.

[0045] The front PCB board 1, the rear PCB board 7, the upper PCB board 5, the lower PCB board, the right PCB board 2 and the left PCB board are rectangular structure PCB boards with sawtooth-shaped edges all around; the sawtooths of the front PCB board 1 and the rear PCB board 7 can be coupled with the sawtooths of the upper PCB board 5, the lower PCB board, the right PCB board 2 and the left PCB board respectively; the sawtooths of the upper PCB board 5 and the lower PCB board can be coupled with the sawtooths of the right PCB board 2 and the left PCB board respectively.

[0046] The upper PCB board 5, the lower PCB board, the right PCB board 2 and the left PCB board are respectively provided with two ion gate positioning holes 15; the ion gate positioning holes 15 can be coupled with the rectangular teeth of the two grids and fix the grids to form a TP ion gate;

[0047] The upper PCB board 5, the lower PCB board, the right PCB board 2 and the left PCB board are respectively provided with grid positioning holes 17; the grid positioning holes 17 can be coupled with the grid rectangular teeth of a grid and fix the grid to form a shielding grid of the Faraday disk.

[0048] The teeth and grooves of the sawtooth of the front PCB board 1, the rear PCB board 7, the upper PCB board 5, the lower PCB board, the right PCB board 2 and the left PCB board may be rectangular, triangular or trapezoidal.

[0049] The electrode strips of the upper PCB board 5, the lower PCB board, the right PCB board 2 and the left PCB board are electrically connected to each other at the same position, and the voltage is divided by the voltage-dividing resistor 4 to form the electric field required by the ion migration tube.

[0050] The copper foil electrode is welded to a ring-shaped radioactive ionization source.

[0051] The copper foil electrode is connected to an external ionization source.

[0052] The ionization source is VUV lamp, corona discharge or laser desorption.

[0053] The grid is processed by laser etching or metal mesh.

[0054] The surfaces of the repulsive electrodes, reaction zone electrode strips, migration zone electrodes, Faraday disks and ground electrodes of the front PCB board 1, the rear PCB board 7, the upper PCB board 5, the lower PCB board, the right PCB board 2 and the left PCB board are plated with gold or tin.

[0055] Example 2

[0056] Figure 1 The figure is a schematic diagram of the overall structure of an ion migration tube composed of PCB boards; the ion migration tube is composed of 6 PCB boards and 3 grids, which respectively include: a front PCB board 1, a rear PCB board 7, an upper PCB board 5, a lower PCB board, a right PCB board 2, a left PCB board and a grid 20; wherein: the lower PCB board has the same structure as the upper PCB board 5, and the rear of the upper PCB board 5 only has more corresponding electrode strips than the lower PCB board, so the upper PCB board 5 is used for illustration; the left PCB board has the same structure as the right PCB board 2, and the right PCB board 2 has only more air outlet 3 than the left PCB board, so the right PCB board 2 is used for illustration.

[0057] Front PCB board 1, see Figure 2 The schematic diagram is a rectangular PCB board. The edges of the PCB board are serrated, and there is a circular hole in the center as a carrier gas port 11. Copper foil is laid around the circular hole as a repelling electrode 13, and a circular radioactive ionization source 12 is welded.

[0058] Right PCB board 2, see Figure 3 The schematic diagram is a rectangular PCB board. The edges of the PCB board are serrated. Electrode strips are distributed in front of the PCB board at a certain interval. These electrode strips are divided into reaction zone electrode strips 14 and migration zone electrode strips 16 by two ion gate positioning holes 15. A grid positioning hole 17 is provided behind the migration zone electrode strip 16 for fixing the grid 20. A circular hole is provided between the ion gate positioning hole 15 and the reaction zone electrode strip 14 as an outlet 3.

[0059] Upper PCB board 5, see Figure 4 The schematic diagram is a rectangular PCB board. The edges of the PCB board are serrated. Electrode strips with a certain spacing are distributed on the front and back sides of the PCB board. These electrode strips are divided into reaction zone electrode strips 14 and migration zone electrode strips 16 by two ion gate positioning holes 15. A grid positioning hole 17 is provided behind the migration zone electrode strip 16 for fixing the grid 20. The reaction zone electrode strips 14 and the migration zone electrode strips 16 on the front and back sides of the PCB board (in this embodiment, the front and back correspond to the inside and outside) are respectively welded with a series of voltage divider resistors 4 for voltage division.

[0060] Rear PCB board 7, see Figure 5 Schematic diagram, a rectangular PCB board. The edges of the rear PCB board are serrated. A circular copper foil is laid in the center of the front of the rear PCB board as a Faraday disk 18. Insulated from the Faraday disk 18, a ring-shaped ground electrode 19 is laid. There is a circular hole in the upper center as a floating air port 9. A signal connector 8 is welded in the center of the back of the rear PCB board to facilitate signal extraction.

[0061] Grid 20, see Figure 6 The schematic diagram is a stainless steel sheet with a rectangular structure and a mesh in the middle, and a mesh rectangular tooth 6 is provided at the center of each of the four sides of the mesh.

[0062] The saw teeth of the front PCB board 1 and the rear PCB board 7 can be coupled with the saw teeth of the upper PCB board 5, the lower PCB board, the right PCB board 2 and the left PCB board respectively. The saw teeth of the upper PCB board 5 and the lower PCB board can be coupled with the saw teeth of the right PCB board 2 and the left PCB board respectively.

[0063] The two ion gate positioning holes 15 of the upper PCB board 5, the lower PCB board, the right PCB board 2 and the left PCB board can be coupled with the rectangular grid teeth 6 of the two grids 20 and fix the grids 20 to form a TP ion gate.

[0064] The grid positioning holes 17 of the upper PCB board 5 , the lower PCB board, the right PCB board 2 and the left PCB board can be coupled with the grid rectangular teeth 6 of a grid 20 and fix the grid 20 to form a shielding grid of the Faraday disk 18 .

[0065] The front PCB board 1, the rear PCB board 7, the upper PCB board 5, the lower PCB board, the right PCB board 2 and the left PCB board are each one, and are coupled with three grids 20 to form a rectangular PCB board ion migration tube.

[0066] Preferably, the teeth 10 and the tooth grooves of the sawtooth of the front PCB board 1, the rear PCB board 7, the upper PCB board 5, the lower PCB board, the right PCB board 2 and the left PCB board may be rectangular, triangular or trapezoidal.

[0067] Preferably, the electrode strips of the upper PCB board 5, the lower PCB board, the right PCB board 2 and the left PCB board are electrically connected to each other at the same position, and the voltage is divided by the voltage-dividing resistor 4 to form the electric field required by the ion migration tube.

[0068] Preferably, the radioactive ionization source 12 of the front PCB board 1 can be replaced with an electrode to place the ionization source externally or replaced with other ionization sources, such as a VUV lamp, corona discharge or laser desorption.

[0069] Preferably, the grid 20 can be processed by laser etching or metal mesh processing.

[0070] Preferably, the repulsive electrode 13, the reaction zone electrode strip 14, the migration zone electrode 16, the Faraday disk and the ground electrode 19 of the front PCB board 1, the rear PCB board 7, the upper PCB board 5, the lower PCB board, the right PCB board 2 and the left PCB board can be plated with gold or tin to improve the electrode quality.

[0071] Figure 7 This is the real-time spectrum of negative ion RIP measured by the ion migration tube composed of the patented PCB board. The ion migration tube composed of the PCB board can work normally and detect substances like a traditional migration tube.

[0072] Within the technical field of the invention, several equivalent substitutions or obvious modifications may be made without departing from the concept of the invention, and the performance or use are the same, which should be regarded as belonging to the protection scope of the invention.

Claims

1. An ion transfer tube composed of a PCB board, characterized in that: It includes a front PCB board, a rear PCB board, an upper PCB board, a lower PCB board, a right PCB board and a left PCB board, and a TP ion gate formed by two grids from front to back and a Faraday disk shielding grid formed by one grid arranged inside the rectangular column; The front PCB board has a circular hole in the center as a carrier gas port; copper foil as a repelling electrode is laid around the circular hole; A circular copper foil is laid at the center of the front of the rear PCB board as a Faraday disk; a ring-shaped ground electrode is laid concentrically and spaced apart from the Faraday disk; a circular hole is laid at the upper center as a floating air outlet; a signal connector is welded at the center of the rear of the rear PCB board; A reaction zone is formed in front of the TP ion gate; a migration zone is formed between the TP ion gate and the Faraday disk shielding grid; The upper PCB board, the lower PCB board, the right PCB board and the left PCB board inside the reaction zone and the migration zone are respectively provided with electrode strips; the upper PCB board outside the reaction zone and the migration zone is respectively provided with electrode strips, and the electrode strips inside and outside the upper PCB board of the reaction zone and the migration zone are provided with voltage divider resistors; On the right PCB board between the electrode strip in the reaction area and the TP ion gate, a circular hole is provided as a gas outlet; The grid is a stainless steel sheet with a rectangular structure and a mesh in the middle; A rectangular tooth of the grid is provided at the center of each of the four sides of the grid; The copper foil electrode is welded to a ring-shaped radioactive ionization source; The copper foil electrode is connected to an external ionization source.

2. The ion migration tube composed of PCB boards according to claim 1, characterized in that: The front PCB board, the rear PCB board, the upper PCB board, the lower PCB board, the right PCB board and the left PCB board are rectangular PCB board materials, and the edges around them are serrated; the sawteeth of the front PCB board and the rear PCB board can be coupled with the sawteeth of the upper PCB board, the lower PCB board, the right PCB board and the left PCB board respectively; the sawteeth of the upper PCB board and the lower PCB board can be coupled with the sawteeth of the right PCB board and the left PCB board respectively.

3. The ion migration tube composed of PCB boards according to claim 1, characterized in that: The upper PCB board, the lower PCB board, the right PCB board and the left PCB board are respectively provided with two ion gate positioning holes; the ion gate positioning holes can be coupled with the rectangular teeth of the two grids and fix the grids to form a TP ion gate; The upper PCB board, the lower PCB board, the right PCB board and the left PCB board are respectively provided with grid positioning holes; the grid positioning holes can be coupled with the grid rectangular teeth of a grid and fix the grid to form a shielding grid of the Faraday disk.

4. The ion migration tube composed of PCB boards according to claim 1, characterized in that: The teeth and grooves of the saw teeth of the front PCB board, the rear PCB board, the upper PCB board, the lower PCB board, the right PCB board and the left PCB board are rectangular, triangular or trapezoidal.

5. The ion migration tube composed of PCB boards according to claim 1, characterized in that: The electrode strips of the upper PCB board, the lower PCB board, the right PCB board and the left PCB board are electrically connected to each other at the same position, and the voltage is divided by the voltage-dividing resistor to form the electric field required by the ion migration tube.

6. The ion migration tube composed of PCB boards according to claim 1, characterized in that: The ionization source is VUV lamp, corona discharge or laser desorption.

7. The ion migration tube composed of PCB boards according to claim 1, characterized in that: The grid is processed by laser etching or metal mesh.

8. The ion migration tube composed of PCB boards according to claim 1, characterized in that: The surfaces of the repulsive electrodes, reaction zone electrode strips, migration zone electrodes, Faraday plates and ground electrodes of the front PCB board, the rear PCB board, the upper PCB board, the lower PCB board, the right PCB board and the left PCB board are plated with gold or tin.

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