A sample introduction purge system for an elemental analyzer

Abstract

The utility model discloses an element analysis appearance's sampling purging system, including pressure -stabilizing valve, argon input pipeline no.

Description

Technical Field

[0001] This utility model relates to the technical field of sample introduction and purging systems for elemental analyzers, specifically to a sample introduction and purging system for an elemental analyzer. Background Technology

[0002] An elemental analyzer is a precision instrument used to determine the elemental composition and content of substances. It is widely used in fields such as chemistry, materials science, environmental monitoring, pharmaceuticals, and geological exploration. Its core principle is to decompose the sample through physical or chemical means, use chromatographic techniques to detect the characteristic signals of elements, and then quantitatively analyze the target components. These instruments play an irreplaceable role in quality control, new material development, and pollutant tracing, and are key analytical tools in scientific research and industry.

[0003] The sample introduction and purging system is a key component of an elemental analyzer, primarily used to address the issue of air contamination in sample blanks, thereby significantly improving data accuracy. By selecting either argon or helium to purge the experimental samples, the problem of air adhering to the sample surface can be eliminated. However, existing automatic sampler systems in elemental analyzers suffer from low purging efficiency, potentially leading to sample contamination by air, and the use of high-flow-rate helium increases experimental costs. Therefore, we propose a sample introduction and purging system for elemental analyzers. Summary of the Invention

[0004] The technical problem this invention aims to solve is to overcome the shortcomings of existing systems and provide a sample introduction and purging system for an elemental analyzer that can remove air interference, effectively reducing experimental costs while solving the problem. To achieve the above objectives, this utility model provides the following technical solution: a sample introduction and purging system for an elemental analyzer, comprising a pressure regulating valve, an argon gas input pipeline I, an argon gas MFC, an argon gas input pipeline II, a helium reference gas output pipeline I, a helium three-way valve, a helium venting pipeline, a helium reference gas output pipeline II, a gas selection three-way valve, and a purging gas pipeline. The input end of the pressure regulating valve is connected to a cylinder pressure reducing valve via an external argon gas input pipeline, and the argon gas is supplied by an argon gas cylinder. The output end of the pressure regulating valve is connected to the argon gas input pipeline I.

[0005] Furthermore, the argon MFC input terminal is connected to argon input pipeline one, and the argon MFC output terminal is connected to argon input pipeline two.

[0006] Furthermore, the input end of the helium three-way valve is connected to the reference gas input port of the detector through a helium reference gas output pipeline one, and the output end of the helium three-way valve is divided into two paths, connected to a helium vent pipeline and an argon input pipeline two.

[0007] Furthermore, the gas selection three-way valve has two input terminals, which are respectively connected to the argon gas input line two and the helium reference gas output line two. The output terminal of the gas selection three-way valve is connected to the inlet terminal of the purge gas line, and the purge gas line is connected to the autosampler of the elemental analyzer.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows: The sample introduction and purging system technology of this elemental analyzer has the following advantages: 1. Depending on the actual needs, you can choose to use argon or helium for purging. For large-volume samples requiring a larger gas volume for purging, argon can be used to save costs. Argon purging reduces the influence of outside air on the sample surface.

[0009] 2. For samples of standard volume, helium purging can be performed directly. The helium used is recycled helium from the detector, effectively saving costs. Helium purging reduces the influence of outside air on the sample surface. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model; In the diagram: 1. External argon gas input line, 2. Pressure regulator valve, 3. Argon gas input line one, 4. Argon MFC, 5. Argon gas input line two, 6. Gas selection three-way valve, 7. Helium reference gas output line one, 8. Helium three-way valve, 9. Helium vent line, 10. Helium reference gas output line two, 11. Purge gas line, 12. Autosampler, 13. Argon gas cylinder, 14. Cylinder pressure reducing valve, 15. Detector. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0012] Please see Figure 1 This embodiment provides a technical solution: a sample introduction and purging system for an elemental analyzer, including 2 pressure regulating valve, 3 argon gas input line one, 4 argon gas MFC, 5 argon gas input line two, 6 gas selection three-way valve, 7 helium reference gas output line one, 8 helium three-way valve, 9 helium venting line, 10 helium reference gas output line two, and 11 purging gas line; The outer argon cylinder 13 is connected via a cylinder pressure reducing valve 14. The cylinder pressure reducing valve is connected to the inlet of the external argon pipeline 1. The outlet of the external argon pipeline 1 is connected to the inlet of the pressure regulating valve 2. The outlet of the pressure regulating valve 2 is connected to the inlet of the argon input pipeline 1 3. The outlet of the argon input pipeline 1 3 is connected to the inlet of the argon MFC 4. The argon MFC 4 is the argon gas mass flow controller. The outlet of the argon MFC 4 is connected to the inlet of the argon input pipeline 2. The outlet of the argon input pipeline 2 is connected to one of the inlets of the gas selection three-way valve 6. The reference gas outlet of the peripheral detector 15 is connected to the inlet of the helium reference gas output pipeline 1 7. The outlet of the helium reference gas output pipeline 1 7 is connected to the inlet of the helium three-way valve 8. One outlet of the helium three-way valve 8 is connected to the helium vent pipeline 9, and the other outlet is connected to the inlet of the helium reference gas output pipeline 2 10. The outlet of the helium reference gas output pipeline 2 10 is connected to one of the inlets of the gas selection three-way valve 6. The gas selection three-way valve 6 selects argon or helium according to the settings, and discharges the selected gas from the outlet purge gas line 11. The purge gas line 11 is connected to the external automatic sampler 12 to purge the sample surface. The working principle of the sample introduction and purging system of the elemental analyzer provided by this utility model is as follows: If the surface of a large volume sample is to be purged (for example, the sample mass is greater than or equal to 100mg), a larger purging gas is required, and the cost of using helium increases significantly. Therefore, argon can be used in this case. When using argon, turn on the main switch of argon cylinder 13, adjust the output pressure of cylinder pressure reducing valve 14 to 0.20 MPa, and the argon gas comes out through external argon gas input line 1 to reach pressure regulating valve 2. The pressure of pressure regulating valve 2 is set to 0.15 MPa, and the stabilized argon gas comes to argon MFC 4 through argon gas input line 1 3. Argon MFC 4 can be set to a flow rate of 200 ml / min (e.g., sample mass of 100 mg) or other flow rates. The set gas comes out from argon MFC 4 and comes to one of the inlets of gas selection three-way valve 6 through argon gas input line 2. At this time, helium three-way valve 8 closes the port connected to helium reference gas output line 2 10, gas selection three-way valve 6 closes the port connected to helium reference gas input line 2 10, and opens the port connected to purge gas line 11 to deliver argon gas to purge gas line 11. Argon gas purges the sample surface on autosampler 12. When using helium, the main switch of argon cylinder 13 is closed. Helium gas (the flow rate of which is usually 80-150 ml / min, suitable for samples with a mass of less than 100 mg) from the reference gas port of detector 15 passes through helium reference gas output line 17 and arrives at helium three-way valve 8. Helium three-way valve 8 closes the port connected to helium vent line 9 and opens the port connected to helium reference gas output line 20. Gas selection three-way valve 6 closes the port connected to argon gas input line 25 and opens the port connected to helium reference gas input line 20. It also opens the port connected to purge gas line 11, delivering helium gas to purge gas line 11. The helium gas purges the sample surface on autosampler 12. The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A sample introduction and purging system for an elemental analyzer, comprising a pressure regulating valve (2), an argon gas input line one (3), an argon gas MFC (4), an argon gas input line two (5), a helium reference gas output line one (7), a helium three-way valve (8), a helium venting line (9), a helium reference gas output line two (10), a gas selection three-way valve (6), and a purging gas line (11), characterized in that: The input end of the pressure stabilizing valve (2) is connected to the cylinder pressure reducing valve (14) through an external argon gas input pipeline (1), and the argon gas cylinder (13) is responsible for supplying the gas. The output end of the pressure stabilizing valve (2) is connected to the argon gas input pipeline (3).

2. The sample introduction and purging system of an elemental analyzer according to claim 1, characterized in that: The input end of the argon MFC (4) is connected to the first argon input pipeline (3), and the output end of the argon MFC (4) is connected to the second argon input pipeline (5).

3. The sample introduction and purging system of an elemental analyzer according to claim 1, characterized in that: The input end of the helium three-way valve (8) is connected to the reference gas input port of the detector through the helium reference gas output pipeline one (7). The output end of the helium three-way valve (8) is divided into two paths, which are connected to the helium vent pipeline (9) and the argon input pipeline two (5).

4. The sample introduction and purging system of an elemental analyzer according to claim 1, characterized in that: The gas selection three-way valve (6) has two input ends, which are connected to the argon gas input line two (5) and the helium reference gas output line two (10) respectively. The output end of the gas selection three-way valve (6) is connected to the inlet end of the purge gas line (11), and the purge gas line (11) is connected to the autosampler of the elemental analyzer.

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