Efficient sampling system based on air pressure regulation and control

Abstract

The invention relates to the technical field of gas analysis, in particular to an efficient sampling system based on gas pressure regulation and control. Comprising a gas source, a pressure stabilizing valve, a flow meter, a three-way quick connector, a semiconductor dehumidifier, a sucking pump, a purging gas tank and a time-of-flight mass spectrometer, the gas source is connected with the flow meter through the pressure stabilizing valve, and the flow meter is connected with the inlet end of the three-way quick connector through a pipeline; two outlet ends of the three-way quick connector are respectively connected with a sample introduction end of the semiconductor dehumidifier and the sucking pump through pipelines; the purging gas tank is connected with a sample inlet end of the semiconductor dehumidifier through a pipeline, an outlet end of the semiconductor dehumidifier is connected with a sample inlet of the time-of-flight mass spectrometer through a pipeline, and a gas sample dried by the semiconductor dehumidifier enters the time-of-flight mass spectrometer under the assistance of purging gas; the time-of-flight mass spectrometer is used for mass spectrometry of a gas sample. The device has the advantages of being simple in structure, stable in air pressure, efficient in dehumidification and rapid in switching, and interference of moisture to mass spectrum signals is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas analysis, in particular to a high-efficiency sampling system based on gas pressure regulation. BACKGROUND

[0002] In the field of gas analysis, the stability and efficiency of the sampling system directly affect the accuracy of the analysis results. Traditional sampling systems often suffer from decreased analysis sensitivity due to gas pressure fluctuations, humidity interference, or residual gas. In addition, existing systems often use single-function designs, making it difficult to meet multiple requirements such as gas pressure regulation, moisture removal, and high-efficiency sampling. Therefore, there is an urgent need for a high-efficiency sampling system based on gas pressure regulation. SUMMARY

[0003] To solve the above problems, the present application provides a high-efficiency sampling system based on gas pressure regulation to solve the problem of single-function design of existing sampling systems, which makes it difficult to meet multiple requirements such as gas pressure regulation, moisture removal, and high-efficiency sampling.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] The present application provides a high-efficiency sampling system based on gas pressure regulation, which comprises a gas source, a pressure stabilizing valve, a flow meter, a three-way quick connector, a semiconductor dehumidifier, a gas pump, a purge gas tank, and a time-of-flight mass spectrometer. The gas source is used to provide a gas sample, and the gas source is connected to the flow meter through the pressure stabilizing valve. The flow meter is connected to the inlet end of the three-way quick connector through a pipeline. The two outlet ends of the three-way quick connector are connected to the sampling end of the semiconductor dehumidifier and the gas pump through pipelines, respectively.

[0006] The purge gas tank is connected to the sampling end of the semiconductor dehumidifier through a pipeline, and the purge gas tank is used to provide purge gas. The outlet end of the semiconductor dehumidifier is connected to the sampling port of the time-of-flight mass spectrometer through a pipeline. The gas sample dried by the semiconductor dehumidifier enters the time-of-flight mass spectrometer with the assistance of the purge gas. The time-of-flight mass spectrometer is used for mass spectrometric analysis of the gas sample.

[0007] In one possible implementation, the pressure stabilizing valve has a two-stage pressure regulation function. The first stage is a coarse adjustment of the pressure to 0.5±0.05 MPa, and the second stage is a fine adjustment to a set value.

[0008] In one possible implementation, the pressure stabilizing valve is an electronic pressure stabilizing valve.

[0009] In one possible implementation, the flow meter is a mass flow meter.

[0010] In one possible implementation, the gas pump is combined with the time-of-flight mass spectrometer to control the gas pressure change and improve the sampling efficiency.

[0011] In a possible implementation, the air extraction pump is an oil-free vacuum pump.

[0012] In a possible implementation, the semiconductor dehumidifier condenses the moisture in the gas sample through the cold end of the semiconductor refrigeration sheet.

[0013] In a possible implementation, the working temperature of the semiconductor dehumidifier is set to -10℃ to 5℃.

[0014] In a possible implementation, the gas source and the purge gas tank adopt a high-pressure inert gas storage tank with a working pressure range of 0.1-1.5MPa.

[0015] In a possible implementation, the purge gas is high-purity nitrogen.

[0016] The advantages and positive effects of the present application are that the high-efficiency sampling system based on gas pressure regulation provided by the present application has the characteristics of simple structure, stable gas pressure, efficient dehumidification, and rapid switching, reduces the interference of moisture on the mass spectrum signal, and is convenient for use with existing analysis instruments. At the same time, the stability of the gas pressure and the flow rate improves the analysis reproducibility.

[0017] The present application integrates gas pressure regulation, dehumidification, and high-efficiency sampling functions, solves the problem of single function of the existing sampling system, and cannot meet multiple requirements such as gas pressure regulation, dehumidification, and high-efficiency sampling. The system uses a pressure stabilizing valve and a flow meter to ensure the stability of the gas pressure and the flow rate, removes moisture interference through a semiconductor dehumidifier, realizes efficient sampling and cleaning through an air extraction pump and a purge gas, and significantly improves the analysis efficiency and detection sensitivity.

[0018] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structure particularly pointed out in the written description and the accompanying drawings.

[0019] The technical solutions of the present application will be further described in detail below with the help of the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0021] Figure 1 is a structural schematic diagram of the high-efficiency sampling system based on gas pressure regulation of the present application.

[0022] In the figure: 1, gas source; 2, pressure stabilizing valve; 3, flow meter; 4, three-way quick connector; 5, semiconductor dehumidifier; 6, air pump; 7, purge gas; 8, time-of-flight mass spectrometer. DETAILED DESCRIPTION

[0023] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0025] Reference Figure 1 As shown in the figure, the present application provides a high-efficiency sampling system based on air pressure regulation, which comprises a gas source 1, a pressure stabilizing valve 2, a flow meter 3, a three-way quick connector 4, a semiconductor dehumidifier 5, an air pump 6, a purge gas tank 7 and a time-of-flight mass spectrometer 8. The gas source 1 is used to provide a gas sample, the gas source 1 is connected with the flow meter 3 through the pressure stabilizing valve 2, the flow meter 3 is connected with the inlet end of the three-way quick connector 4 through a pipeline, and the two outlet ends of the three-way quick connector 4 are respectively connected with the sampling end of the semiconductor dehumidifier 5 and the air pump 6 through pipelines; the purge gas tank 7 is connected with the sampling end of the semiconductor dehumidifier 5 through a pipeline, and the purge gas tank 7 is used to provide purge gas; the outlet end of the semiconductor dehumidifier 5 is connected with the sampling port of the time-of-flight mass spectrometer 8 through a pipeline, and the dried gas sample after the semiconductor dehumidifier 5 enters the time-of-flight mass spectrometer 8 with the aid of the purge gas, and the time-of-flight mass spectrometer 8 is used for mass spectrum analysis of the gas sample.

[0026] In the embodiment of the present application, the pressure stabilizing valve 2 has a two-stage pressure regulation function, the first stage is coarse adjustment of pressure to 0.5±0.05MPa, and the second stage is fine adjustment to a set value.

[0027] Preferably, the pressure stabilizing valve 2 is an electronic pressure stabilizing valve. The flow meter 3 is a mass flow meter.

[0028] In the embodiment of the present application, the air pump 6 controls the air pressure change in combination with the time-of-flight mass spectrometer 8, which can effectively improve the sampling efficiency. Preferably, the air pump 6 is an oil-free vacuum pump.

[0029] In the embodiment of the present application, the semiconductor dehumidifier 5 condenses the moisture in the gas sample through the cold end of the semiconductor refrigerating sheet, reduces the humidity, and thus improves the detection sensitivity. The working temperature of the semiconductor dehumidifier 5 is set to -10℃ to 5℃.

[0030] In the embodiment of the present application, the gas source 1 and the purge gas tank 7 adopt a high-pressure inert gas storage tank with a working pressure range of 0.1-1.5MPa. Preferably, the purge gas is high-purity nitrogen. The three-way quick connector 4 has components such as a locking clamp and a stepped annular sealing ring, which can effectively prevent gas leakage.

[0031] The present application provides a high-efficiency sampling system based on gas pressure regulation, which adjusts the gas pressure by using the air pump 6 and adjusts the humidity by using the semiconductor dehumidifier 5, and is suitable for rapid and high-sensitivity analysis of gas or volatile liquid samples, and is particularly suitable for use with a time-of-flight mass spectrometer 8.

[0032] During the experiment, the gas source 1 provides a gas sample, which is stabilized in pressure by the pressure stabilizing valve 2, connected to the flow meter 3 through a polytetrafluoroethylene pipe, and the gas sample flow is accurately controlled by the flow meter 3 to realize multi-stage accurate regulation of the gas pressure. The gas sample is divided by the three-way quick connector 4, one part of which enters the semiconductor dehumidifier 5 to condense the moisture in the gas sample through the cold end of the semiconductor refrigerating sheet to reduce the humidity, and the other part of which is adjusted in pressure by the air pump 6. The dried gas sample enters the time-of-flight mass spectrometer 8 for mass spectrometric analysis with the assistance of the purge gas.

[0033] The present application integrates the functions of gas pressure regulation, dehumidification and high-efficiency sampling, solves the problem of single function of the existing sampling system, and cannot meet multiple requirements such as gas pressure regulation, dehumidification and high-efficiency sampling. The system uses the pressure stabilizing valve 2 and the flow meter 3 to ensure the stability of the gas pressure and flow, removes the moisture interference by the semiconductor dehumidifier 5, realizes high-efficiency sampling and cleaning by the air pump 6 and the purge gas, and significantly improves the analysis efficiency and detection sensitivity.

[0034] The present application provides a high-efficiency sampling system based on gas pressure regulation, which has the characteristics of simple structure, stable gas pressure, efficient dehumidification and rapid switching, reduces the interference of moisture on the mass spectrometric signal, and is convenient to use with existing analysis instruments. At the same time, the stability of the gas pressure and flow, by changing the experimental gas pressure, improves the detection efficiency, analysis sensitivity and operation convenience. The present application is suitable for rapid, convenient and high-sensitivity detection of gas samples, and is particularly suitable for use with a time-of-flight mass spectrometer.

[0035] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. An efficient sample injection system based on air pressure control, characterized in that: The invention comprises a gas source (1), a pressure regulating valve (2), a flow meter (3), a three-way quick connector (4), a semiconductor dehumidifier (5), an air pump (6), a purge gas tank (7) and a time-of-flight mass spectrometer (8), wherein the gas source (1) is used to provide a gas sample, the gas source (1) is connected to the flow meter (3) through the pressure regulating valve (2), the flow meter (3) is connected to the inlet end of the three-way quick connector (4) through a pipeline, and the two outlet ends of the three-way quick connector (4) are respectively connected to the sampling end of the semiconductor dehumidifier (5) and the air pump (6) through pipelines; The purge gas tank (7) is connected to the sampling end of the semiconductor dehumidifier (5) through a pipeline, and the purge gas tank (7) is used to provide purge gas; the outlet end of the semiconductor dehumidifier (5) is connected to the sampling port of the time-of-flight mass spectrometer (8) through a pipeline, and the gas sample dried by the semiconductor dehumidifier (5) enters the time-of-flight mass spectrometer (8) with the assistance of the purge gas, and the time-of-flight mass spectrometer (8) is used for mass spectrometry analysis of the gas sample.

2. The high-efficiency sample introduction system based on air pressure control according to claim 1, characterized in that: The pressure stabilizing valve (2) has a two-stage pressure regulating function, wherein the first stage roughly adjusts the pressure to 0.5±0.05 MPa, and the second stage finely adjusts the pressure to a set value.

3. The high-efficiency sample introduction system based on air pressure control according to claim 2, characterized in that: The pressure stabilizing valve (2) is an electronic pressure stabilizing valve.

4. The high-efficiency sample introduction system based on gas pressure control according to claim 1, characterized in that: The flow meter (3) is a mass flow meter.

5. The high-efficiency sample introduction system based on gas pressure control according to claim 1, characterized in that: The vacuum pump (6) is combined with the time-of-flight mass spectrometer (8) to control air pressure changes and improve sampling efficiency.

6. The high-efficiency sample introduction system based on gas pressure control according to claim 1, characterized in that: The air extraction pump (6) is an oil-free vacuum pump.

7. The high-efficiency sample introduction system based on gas pressure control according to claim 1, characterized in that: The semiconductor dehumidifier (5) condenses moisture in the gas sample through the cold end of the semiconductor refrigeration plate.

8. The high-efficiency sample introduction system based on gas pressure control according to claim 1, characterized in that: The operating temperature of the semiconductor dehumidifier (5) is set to -10°C to 5°C.

9. The high-efficiency sample introduction system based on gas pressure control according to claim 1, characterized in that: The gas source (1) and the purge gas tank (7) are high-pressure inert gas storage tanks with an operating pressure range of 0.1-1.5 MPa.

10. The high-efficiency sample introduction system based on gas pressure control according to claim 1, characterized in that: The purge gas is high-purity nitrogen.

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