Small sample injection module

Abstract

The utility model provides a small sample injection module, which belongs to the technical field of small sample gas analysis and comprises a cavity with a pressure sensor, the cavity is respectively connected with a first valve and a second valve through pipelines, the first valve is connected with a third valve through a pipeline, and the second valve is connected with a second valve through a pipeline. A zero gas tank body is arranged on the pipeline between the first valve and the third valve, and the second valve is connected with a standard gas tank body through a pipeline. Through the sample gas detection device disclosed by the utility model, the sample gas can be smoothly guided into an analyzer for analysis if the volume of the gas collected by a worker is less than 20ml in the process of detecting the sample gas; the device can be effectively applied to detection and analysis of small sample gas, and the problem that gas cannot be normally detected due to the fact that enough sample gas cannot be collected is solved.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of small sample gas analysis, in particular to a small sample injection module. Background Art

[0002] Small sample gas usually refers to a small amount of gas sample used for analysis, testing or experiment. In scientific research and industrial applications, small sample gas is widely used. They are characterized by small volume and easy operation and analysis. They usually have the following uses: analytical testing, scientific research, quality control and medical diagnosis. The processing of small sample gas usually requires special equipment and technology to ensure the purity and stability of the sample and avoid composition changes during sampling, storage and transportation.

[0003] Currently, when analyzing small gas samples, the minimum volume of the sample gas passing through the Picarro analyzer must be greater than 150ml. If the volume is less than 150ml, it cannot pass through the Picarro analyzer continuously, and the air intake volume cannot be reached for sample analysis. Therefore, during the sample gas collection process, the staff often cannot collect enough sample gas, resulting in the inability to detect the gas.

[0004] To address this, we developed a Small Sample Isotope Module (SSIM) to work with the Picarro G2101-i, G2121-i, and G2131-i isotope CO2 analyzers, the G2132-i isotope CH4 analyzer, and the G2201-i CO2 & CH4 analyzer to measure gas samples smaller than 20 ml. Utility Model Content

[0005] The technical solution of the present invention addresses the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technology. Specifically, the present invention mainly provides a small sample injection module to solve the technical problem raised in the above background technology that in the current process of analyzing small sample gases, many times the staff cannot collect sample gas larger than 150ml and cannot continuously perform sample analysis through the Picarro analyzer.

[0006] The technical solution adopted by the utility model to solve the above technical problems is:

[0007] A small sample injection module includes a cavity with a pressure sensor, wherein the cavity is respectively connected to a first valve and a second valve through pipelines, the first valve is connected to a third valve through a pipeline, and a zero gas tank is provided on the pipeline between the first valve and the third valve, and the second valve is connected to a standard gas tank through a pipeline.

[0008] Furthermore, a fifth valve is provided on the pipeline between the standard gas tank and the second valve.

[0009] Furthermore, the fifth valve is connected to the sample gas tank through a pipeline.

[0010] Furthermore, the first valve is connected to an external vacuum pump through a pipeline, and a fourth valve is provided on the pipeline between the first valve and the external vacuum pump.

[0011] Furthermore, the second valve and the third valve are connected by a pipeline.

[0012] Furthermore, the third valve is connected to an analyzer via a pipeline.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The utility model ensures the stability of the pressure of the sample gas entering the analyzer during the detection of the sample gas by arranging a sample gas tank, a standard gas tank, a cavity, an analyzer, a zero gas tank, an external vacuum pump and a valve, and keeps the pressure within the target pressure range to measure the isotope ratio in the sample gas. Therefore, when the volume of the gas collected by the staff is less than 20 ml, the sample gas is introduced into the Picarro analyzer for analysis by adjusting the air pressure. The utility model can be effectively applied to the detection of small sample gases, avoiding the problem of normal gas detection failure due to failure to collect enough sample gas. The utility model has a simple structure, is easy to assemble, and has certain practical value.

[0015] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall connection plane of the utility model.

[0017] In the figure: 1. Sample gas tank; 2. Standard gas tank; 3. Cavity; 4. Analyzer; 5. Zero gas tank; 6. External vacuum pump; 7. First valve; 8. Second valve; 9. Third valve; 10. Fourth valve; 11. Fifth valve. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0019] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly used by technicians in the technical field of the present invention. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0021] Please refer to the attached Figure 1 A small sample injection module includes a cavity 3 with a pressure sensor, the cavity 3 is connected to a first valve 7 and a second valve 8 through pipelines, the first valve 7 is connected to a third valve 9 through a pipeline, and a zero gas tank 5 is provided on the pipeline between the first valve 7 and the third valve 9, and the second valve 8 is connected to a standard gas tank 2 through a pipeline.

[0022] A fifth valve 11 is provided on the pipeline between the standard gas tank body 2 and the second valve 8. The fifth valve 11 is connected to the sample gas tank body 1 through a pipeline. The fifth valve 11 is used to control the on-off of the pipeline connecting the sample gas tank body 1 and the standard gas tank body 2. The first valve 7 is connected to the external vacuum pump 6 through a pipeline, and a fourth valve 10 is provided on the pipeline between the first valve 7 and the external vacuum pump 6. Through the mutual cooperation between the external vacuum pump 6 and the fourth valve 10, the previous sample or atmospheric gas that may contaminate the measurement in the pipeline is extracted. The second valve 8 and the third valve 9 are connected by a pipeline. The communication between the second valve 8 and the third valve 9 provides a channel for the standard gas to flow into the analyzer 4. The third valve 9 is connected to the analyzer 4 through a pipeline. Through the analyzer 4, the isotope ratio in the sample gas is measured.

[0023] The above structure ensures that, during the gas sample detection process, even if the volume of gas collected by the operator is less than 20 ml, the sample gas can be smoothly introduced into the Picarro analyzer 4 for analysis. This effectively applies to the detection of small gas samples, avoiding the problem of inability to properly detect gas due to insufficient sample gas collection. Furthermore, the structure is simple and easy to assemble, thus having certain practical value. (This application is designed specifically for isotope ratio measurement, not concentration measurement. Although some internal dilution occurs, the dilution is typically ~5%. Therefore, concentration changes are within the dynamic range of the analyzer 4, and the δ13C measurement value will not change with this small change in concentration. This dilution depends to some extent on the pressure of the zero gas tank 5. The lower the zero gas pressure, the lower the dilution, but dilution cannot be completely eliminated.)

[0024] The specific operation is as follows. Before the measurement, the gas system is flushed with purge gas (zero gas without carbon dioxide and CH4, the gas system has existing equipment and is not shown in the figure) to remove the previous sample or atmospheric gas that may contaminate the measurement in the pipeline. Subsequently, the purge gas is extracted by the external vacuum pump 6 to make the pipeline vacuum. At this time, the staff opens the sample gas tank 1. Since the pipeline is in a vacuum state, the sample gas (about 20ml sample) enters the cavity 3. At the same time, the zero gas tank 5 (select the zero gas tank 5 or the standard gas tank 5 according to the type of gas to be detected) is opened. The tank 2) is opened, and the zero gas flows to the analyzer 4 through the third valve 9 on the pipeline, at the correct mold cavity pressure to meet the detection requirements. Then the first valve 7 is opened, and the sample gas flows into the analyzer 4. The analyzer 4 extracts gas from the only opened sample volume. As the pressure in the sample gas volume decreases, the outlet valve of the analyzer 4 is slowly closed to maintain the correct pressure in the analyzer 4 and ensure that the pressure remains within the target pressure. Using the pressure sensor in the cavity 3, the balance between the pressure of the sample gas tank 1 and the pressure of the cavity 3 can be monitored when the analyzer 4 receives the sample gas.

[0025] The above description of the present invention is illustrative in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A small sample injection module, comprising a cavity (3) with a pressure sensor, wherein the cavity (3) is connected to a first valve (7) and a second valve (8) via pipelines, characterized in that: The first valve (7) is connected to the third valve (9) via a pipeline, and a zero gas tank (5) is provided on the pipeline between the first valve (7) and the third valve (9), and the second valve (8) is connected to the standard gas tank (2) via a pipeline.

2. A small sample injection module according to claim 1, characterized in that: A fifth valve (11) is provided on the pipeline between the standard gas tank (2) and the second valve (8).

3. A small sample injection module according to claim 2, characterized in that: The fifth valve (11) is connected to the sample gas tank (1) via a pipeline.

4. A small sample injection module according to claim 1, characterized in that: The first valve (7) is connected to an external vacuum pump (6) via a pipeline, and a fourth valve (10) is provided on the pipeline between the first valve (7) and the external vacuum pump (6).

5. The small sample injection module according to claim 2, characterized in that: The second valve (8) and the third valve (9) are connected by a pipeline.

6. The small sample injection module according to claim 5, characterized in that: The third valve (9) is connected to the analyzer (4) via a pipeline.

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