Electrostatic analyzer of mass spectrometer

Abstract

The electrostatic analyzer comprises an electrostatic analysis tube which is of an arc-shaped tubular structure with the two ends communicated, an opening is formed in one axial side face of the electrostatic analysis tube, and the electrostatic analysis tube comprises an arc-shaped bottom plate and a U-shaped opening channel formed by two arc-shaped side plates arranged perpendicular to the arc-shaped bottom plate; shielding sheet mounting grooves are formed in the two ends, located on the inner side of the electrostatic analysis tube, of the arc-shaped bottom plate correspondingly, and a plurality of positioning holes are formed in the arc-shaped bottom plate in the axial direction of the electrostatic analysis tube. A cover plate capable of totally sealing an opening is arranged at the opening of the electrostatic analysis tube, and the electrostatic analysis tube forms a tubular structure with two through ends; and through the arrangement of the opening and the cover plate, the mounting precision of the electrode plate can be effectively measured through the three-coordinate measuring instrument after the electrode plate is mounted in the electrostatic analysis tube, so that the mounting effect is ensured, and the mounting precision is closer to the theoretical precision.

Description

Technical Field

[0001] This utility model relates to the field of mass spectrometry analysis technology, and more specifically, to an electrostatic analyzer for a mass spectrometer. Background Technology

[0002] Dual-focusing mass spectrometers are high-resolution mass spectrometry techniques that combine directional focusing and energy focusing. Through the synergistic effect of electrostatic and magnetic analyzers, they can simultaneously eliminate spatial divergence and kinetic energy dispersion of the ion beam, significantly improving mass spectrometry resolution.

[0003] As the core component of the dual-focusing system, the electrostatic analyzer utilizes a radial electrostatic field to achieve ion kinetic energy screening, and its performance directly determines the instrument's resolution and overall transmission efficiency.

[0004] Current electrostatic analyzers all use cylindrical or spherical electrodes to filter ion kinetic energy through a uniform radial electric field.

[0005] The uniformity of cylindrical or spherical electrodes is easily affected by processing errors and assembly precision, causing ion flight trajectory deviation, making it difficult to suppress higher-order aberrations, and ultimately resulting in low instrument sensitivity and unsatisfactory ion beam focusing. Utility Model Content

[0006] The purpose of this invention is to provide an electrostatic analyzer for a mass spectrometer, an electrostatic analyzer that can improve installation accuracy and reduce system errors.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a mass spectrometer electrostatic analyzer, including an electrostatic analysis tube, which is an arc-shaped tubular structure with both ends connected, and an opening is provided on one side of its axial direction. The electrostatic analysis tube includes an arc-shaped bottom plate and a U-shaped opening channel formed by two arc-shaped side plates arranged perpendicular to the arc-shaped bottom plate.

[0008] The arc-shaped base plate has grooves for mounting the shielding sheet at both ends inside the electrostatic analysis tube, and several positioning holes are provided along the axial direction of the electrostatic analysis tube.

[0009] The electrostatic analysis tube contains two parallel electrode plates. Several insertion posts matching the positioning holes are provided on the side of the electrode plates near the arc-shaped base plate. A connector is provided near the top opening of the electrostatic analysis tube to fix the relative position of the electrode plates.

[0010] The electrostatic analysis tube has a cover plate at the opening that can completely seal the opening, forming a tubular structure that is open at both ends.

[0011] The opening and cover design allows for effective measurement of the electrode installation accuracy using a coordinate measuring machine after the electrostatic analysis tube is mounted on the instrument platform, thus ensuring the installation effect is closer to the theoretical accuracy.

[0012] The present invention is further configured such that: the shielding sheet has an L-shaped structure, the bottom of the shielding sheet is smaller than the mounting groove, and the bottom of the shielding sheet is provided with a strip keyway for easy connection.

[0013] The installation slot and the keyway on the shielding plate allow for some redundancy in the installation of the shielding plate within the installation slot, thus enabling secondary fine-tuning after installation and further assisting the measurement of the three-dimensional coordinate measuring machine.

[0014] The present invention is further configured such that the two electrode plates are concentrically arranged and the two arc-shaped side plates are also concentrically arranged.

[0015] The concentricity of the two electrode plates is set as the theoretical state, and the concentricity of the arc plate is set as the standard state. However, in actual practice, fine-tuning is required to achieve the theoretical state. In this solution, the detachable design allows for fine-tuning. Compared to the electrostatic analysis tube that is directly installed after being molded in one piece, this design allows for adjustment and thus can more closely approximate the theoretical state.

[0016] The present invention is further configured such that each end of the two electrode plates is provided with a shielding plate, and each shielding plate is fixedly connected to each electrode plate at the same time.

[0017] The shielding sheet is fixed to the electrode sheet at both ends. After the shielding sheet is fixed, it is measured again by the three-dimensional coordinate measuring machine. Only then can the encapsulation guarantee sufficient theoretical accuracy, because there is a certain possibility that accuracy problems may occur in any installation step, transportation, etc.

[0018] The present invention is further configured such that: a connecting piece is provided at the opening of the electrostatic analysis tube, the connecting piece can close the opening of the electrostatic analysis tube, the connecting piece is provided with an arc-shaped groove communicating with the electrostatic analysis tube, a sealing groove is provided along the circumference of the arc-shaped groove, a sealing strip is also provided in the sealing groove, and a cover plate is fixedly provided on the side of the connecting piece away from the electrostatic analysis tube.

[0019] To address the technical challenge that any step could alter the subtle details of the tube or its installation, a connecting piece is incorporated. This connecting piece stabilizes the tube, and the cover plate, which connects only to the connecting piece, effectively prevents direct contact with the tube. Furthermore, the connecting piece ensures easy observation while also providing a seal, thus guaranteeing the vacuum level inside the tube.

[0020] In summary, this utility model has the following beneficial effects: the opening and cover plate design allows for effective measurement of the electrode installation accuracy using a coordinate measuring machine after the electrode is installed inside the electrostatic analysis tube, thereby ensuring the installation effect and bringing it closer to the theoretical accuracy. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the first structure in an embodiment of the present utility model;

[0024] Figure 3 This is a schematic diagram of the second structure in an embodiment of the present utility model;

[0025] Figure 4 This simulation verifies the focusing effect of the electrostatic analyzer in this embodiment of the invention. Figure 1 ;

[0026] Figure 5 This simulation verifies the focusing effect of the electrostatic analyzer in this embodiment of the invention. Figure 2 ;

[0027] Figure 6 This simulation verifies the focusing effect of the electrostatic analyzer in this embodiment of the invention. Figure 3 .

[0028] As shown in the figure:

[0029] 1. Electrostatic analysis tube; 2. Cover plate; 3. Connector; 4. Electrode plate; 5. Connecting plate; 6. Sealing groove; 7. Shielding plate; 8. Insert post; 9. Arc-shaped side plate; 10. Arc-shaped base plate; 11. Mounting groove; 12. Positioning hole. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model.

[0032] The following is in conjunction with the appendix Figures 1-3 The present invention will be described in further detail below.

[0033] Example

[0034] like Figure 1 , Figure 2 , Figure 3 As shown, an electrostatic analyzer for a mass spectrometer includes an electrostatic analysis tube 1, which is an arc-shaped tubular structure with both ends connected, and an opening is provided on one side of its axial direction. The electrostatic analysis tube 1 includes an arc-shaped bottom plate 10 and a U-shaped opening channel formed by two arc-shaped side plates 9 arranged perpendicular to the arc-shaped bottom plate 10.

[0035] The arc-shaped base plate 10 has mounting slots 11 for the shielding sheet 7 at both ends of the inner side of the electrostatic analysis tube 1, and the arc-shaped base plate 10 has a number of positioning holes 12 along the axial direction of the electrostatic analysis tube 1.

[0036] Two parallel electrode plates 4 are provided inside the electrostatic analysis tube 1. Several insertion posts 8 that match the positioning holes 12 are provided on the side of the electrode plate 4 near the arc-shaped base plate 10. A connector 3 that fixes the relative position of the electrode plate 4 is provided near the top opening of the electrostatic analysis tube 1.

[0037] The opening of the electrostatic analysis tube 1 is provided with a cover plate 2 that can completely seal the opening, and the electrostatic analysis tube 1 forms a tubular structure that is open at both ends.

[0038] The opening and cover plate 2 allow for effective measurement of the installation accuracy of the electrode plate 4 after the electrostatic analysis tube 1 is installed on the instrument table, using a coordinate measuring machine. This ensures the installation effect is closer to the theoretical accuracy.

[0039] The shielding plate 7 has an L-shaped structure. The bottom of the shielding plate 7 is smaller than the mounting groove 11. The bottom of the shielding plate 7 is provided with a strip keyway for easy connection.

[0040] Preferably, the mounting groove 11 is a 3mm deep groove inside the electrostatic analysis tube 1, with the same width as the shielding sheet 7 and a length 6mm longer than the bottom of the shielding sheet 7. In use, the shielding sheet 7 is embedded in the mounting groove 11, and the shielding sheet 7 can move back and forth a certain distance to test the shielding effect. The mounting groove 11 has screw holes for fixing positions, and the bottom of the shielding sheet 7 has a strip keyway so that when the shielding sheet 7 moves back and forth, the screws can pass through the base and be fixed in the screw holes.

[0041] The installation slot 11 and the keyway on the shielding plate 7 allow for a certain degree of redundancy in the installation of the shielding plate 7 within the installation slot 11, thereby enabling secondary fine-tuning after installation and further assisting the measurement of the three-dimensional coordinate measuring instrument.

[0042] The two electrode plates 4 are concentrically arranged, and the two arc-shaped side plates 9 are also concentrically arranged.

[0043] The concentricity of the two electrode plates 4 is set as the theoretical state, and the concentricity of the arc plate is set as the standard state. However, in actual practice, the theoretical state can only be achieved through fine-tuning. In this solution, the detachable design allows for fine-tuning. Compared to the electrostatic analysis tube 1, which is directly installed after being molded as a whole, this design allows for adjustment and thus can be closer to the theoretical state.

[0044] Each of the two electrode plates 4 has a shielding plate 7 at its end, and each shielding plate 7 is fixedly connected to each electrode plate 4.

[0045] The shielding sheet 7 is fixed to the electrode sheet 4 at both ends. After the shielding sheet 7 is fixed, it is measured again by the three-dimensional coordinate measuring machine. Only then can the encapsulation ensure sufficient theoretical accuracy, because there is a certain possibility that accuracy problems may occur in any installation step, transportation, etc.

[0046] A connecting piece 5 is provided at the opening of the electrostatic analysis tube 1. The connecting piece 5 can close the opening of the electrostatic analysis tube 1. The connecting piece 5 is provided with an arc-shaped groove that communicates with the electrostatic analysis tube 1. A sealing groove 6 is provided around the arc-shaped groove. A sealing strip is also provided in the sealing groove 6. The cover plate 2 is fixedly provided on the side of the connecting piece 5 away from the electrostatic analysis tube 1.

[0047] To address the technical issue that any step could potentially alter the subtle details of the tube body or installation, a connecting piece 5 is incorporated. The connecting piece 5 stabilizes the tube body, and the cover plate 2 is only connected to the connecting piece 5, effectively preventing direct connection with the tube body. Furthermore, the connecting piece 5 ensures easy observation while also achieving a sealing effect, thus guaranteeing the vacuum level inside the tube.

[0048] Preferably, there is one positioning hole 12 under each of the inner and outer electrodes of the electrode plate 4, precisely located at the corresponding arc position of the electrode. After the electrode plate 4 is fixed to the insert post 8 with screws, it is inserted into the electrostatic analysis tube 1 at the position corresponding to the positioning hole 12, achieving the dual effect of fixing and positioning. The positioning hole 12 is 5mm deep and the insert post 8 is 10mm high. Therefore, after insertion and fixing, there is still a 5mm distance between the bottom of the electrode plate 4 under pressure and the grounded base surface of the electrostatic analyzer cavity, which meets the insulation requirements. The insert post 8 is made of highly insulating ceramic material.

[0049] Figure 4 , 5 Figure 6 shows a simulation of the focusing effect of the electrostatic analyzer verified using COMSOL 6.1. The software simulates the emission of three groups of ions with varying energy from a theoretical point. After passing through the electrostatic analyzer, the ions disperse due to energy differences, and then focus again at the same point after passing through a matched magnetic analyzer. The simulation verifies the dual-focusing capability of the electrostatic analyzer and the matched magnetic analyzer.

[0050] The above description is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An electrostatic analyzer for a mass spectrometer, characterized in that, The electrostatic analysis tube (1) has an arc-shaped tubular structure with both ends connected, and an opening is provided on one side of its axial direction. The electrostatic analysis tube (1) includes an arc-shaped bottom plate (10) and a U-shaped opening channel formed by two arc-shaped side plates (9) arranged perpendicular to the arc-shaped bottom plate (10). The arc-shaped base plate (10) has mounting slots (11) for the shielding sheet (7) at both ends inside the electrostatic analysis tube (1), and the arc-shaped base plate (10) has several positioning holes (12) along the axial direction of the electrostatic analysis tube (1). Two parallel electrode plates (4) are provided inside the electrostatic analysis tube (1). Several insertion posts (8) matching the positioning holes (12) are provided on the side of the electrode plate (4) near the arc-shaped base plate (10). A connector (3) for fixing the relative position of the electrode plate (4) is provided near the top opening of the electrostatic analysis tube (1). The opening of the electrostatic analysis tube (1) is provided with a cover plate (2) that can completely seal the opening, and the electrostatic analysis tube (1) forms a tubular structure that is open at both ends.

2. The electrostatic analyzer for a mass spectrometer according to claim 1, characterized in that: The shielding plate (7) has an L-shaped structure. The bottom of the shielding plate (7) is smaller than the mounting groove (11). The bottom of the shielding plate (7) is provided with a strip keyway for easy connection.

3. The electrostatic analyzer for a mass spectrometer according to claim 1, characterized in that: The two electrode plates (4) are concentrically arranged, and the two arc-shaped side plates (9) are also concentrically arranged.

4. The electrostatic analyzer for a mass spectrometer according to claim 1, characterized in that: Each of the two electrode plates (4) is provided with a shielding plate (7) at its end, and each shielding plate (7) is fixedly connected to each electrode plate (4).

5. The electrostatic analyzer for a mass spectrometer according to claim 1, characterized in that: A connecting piece (5) is provided at the opening of the electrostatic analysis tube (1). The connecting piece (5) can close the opening of the electrostatic analysis tube (1). The connecting piece (5) is provided with an arc-shaped groove that communicates with the electrostatic analysis tube (1). A sealing groove (6) is provided around the arc-shaped groove. A sealing strip is also provided in the sealing groove (6). The cover plate (2) is fixedly provided on the side of the connecting piece (5) away from the electrostatic analysis tube (1).

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