Gas sampling device capable of automatically adding internal standard

Abstract

The utility model relates to the technical field of analytical instruments, in particular to a gas sampling device capable of automatically adding an internal standard, which comprises an internal standard two-position six-way valve and a sample two-position six-way valve, the device further comprises an internal standard quantitative loop, a sample quantitative loop and a sample selection valve; an internal standard quantitative ring is mounted in the internal standard two-position six-way valve; a sample quantitative loop is mounted in the sample two-position six-way valve; interfaces on the upper sides of the left end and the right end of the internal standard two-position six-way valve are respectively provided with an internal standard electromagnetic valve and an internal standard gas flow limiting ring; a sampling electromagnetic valve and a sampling vacuum pump are mounted at a lower interface of the right end of the sample two-position six-way valve; according to the utility model, a double-quantitative-loop structure is designed, one quantitative loop is used as an internal standard quantitative loop, the other quantitative loop is used as a quantitative loop of an analyzed sample, and filling and sample introduction of the sample are realized through switching of the six-way valve; after the two quantitative rings are respectively filled with internal standard gas and sample gas, the internal standard gas and the sample gas are simultaneously brought into detection equipment for analysis through chromatographic carrier gas.

Description

Technical Field

[0001] The utility model relates to the technical field of analytical instruments, in particular to a gas sampling device capable of automatically adding an internal standard. Background Art

[0002] With the rapid development of my country's industrial manufacturing level, people's living standards have also been greatly improved. While the industry is developing rapidly, environmental pollution has become an issue that people pay more and more attention to. Air is the most important factor affecting the human body, and its detection is particularly important. Generally, people detect gases through gas chromatography or gas chromatography-mass spectrometry, usually using direct gas sampling and external standard method to perform qualitative and quantitative calculations of the test results.

[0003] The gas sampling device includes an injection arm, a sampling needle, a sample tray, a cleaning system, a drive system, and a control system. The sample to be tested is placed in a sealed container and heated to evaporate the volatile components from the sample matrix. Then, after equilibrium is reached between the gas-liquid (or gas-solid) phases, the top gas is directly extracted for chromatographic analysis to verify the composition and content of the volatile components in the sample. However, existing gas automatic sampling devices are only suitable for external standard methods and internal standards can only be added manually.

[0004] Therefore, in order to solve the problem that the above method is only applicable to the external standard method and the internal standard can only be added manually, a device that can automatically add the internal standard can be designed. Utility Model Content

[0005] In order to overcome the problem that it is only applicable to the external standard method and the internal standard can only be added manually.

[0006] The technical solution of the utility model is: a gas sampling device that can automatically add an internal standard, including a two-position six-way valve for internal standard and a two-position six-way valve for sample; also including an internal standard quantitative ring, a sample quantitative ring and a sample selection valve; the internal standard quantitative ring is installed in the two-position six-way valve for internal standard; the sample quantitative ring is installed in the two-position six-way valve for sample; the interfaces on the upper sides of the left and right ends of the two-position six-way valve for internal standard are respectively installed with an internal standard solenoid valve and an internal standard gas flow limiting ring; the interface on the lower side of the right end of the two-position six-way valve for sample is installed with a sampling solenoid valve and a sampling vacuum pump; the interface on the lower side of the left end of the two-position six-way valve for sample is installed with a mass flow controller and a sample selection valve.

[0007] Preferably, when the gas sample needs to be analyzed as Figure 1The internal standard two-position six-way valve and the sample two-position six-way valve are in the states shown. The internal standard solenoid valve is further opened to fill the internal standard quantitative loop with internal standard gas. The internal standard gas flow limiting ring limits the flow through the quantitative loop, thereby saving the internal standard gas. The sample selection valve is further rotated to the position where the sample is connected, the sampling solenoid valve is opened, and the sampling vacuum pump starts working. At the same time, the mass flow controller controls the gas flow through the sample quantitative loop. When the internal standard quantitative loop and the sample quantitative loop are full, the internal standard two-position six-way valve and the sample two-position six-way valve are switched to Figure 2 At this time, the gas in the internal standard quantitative loop and the sample quantitative loop is carried into the gas chromatograph by the chromatographic carrier gas for analysis. After the injection is completed, the internal standard two-position six-way valve and the sample two-position six-way valve are switched back to Figure 1 The analysis process of the next sample is continued until all samples are analyzed.

[0008] Preferably, the internal standard two-position six-way valve is provided with 6 interfaces, which are interfaces 1, 2, 3, 4, 5 and 6 in clockwise order from the lower left.

[0009] Preferably, the sample two-position six-way valve is provided with six interfaces, which are interfaces 1, 2, 3, 4, 5 and 6 in counterclockwise order from the upper left.

[0010] Preferably, the 6th interface of the internal standard two-position six-way valve is connected to the 1st interface of the sample two-position six-way valve; the 6th interface of the sample two-position six-way valve is connected to the GC inlet; and the 1st interface of the internal standard two-position six-way valve is connected to the GC carrier gas.

[0011] Preferably, the internal standard solenoid valve is connected to the 3rd interface of the internal standard two-position six-way valve; the internal standard gas flow limiting ring is connected to the 4th interface of the internal standard two-position six-way valve.

[0012] Preferably, the sampling solenoid valve and the sampling vacuum pump are connected to the 4th interface of the sample two-position six-way valve; the mass flow controller and the sample selection valve are connected to the 3rd interface of the sample two-position six-way valve.

[0013] Preferably, the sample selection valve is provided with 10 interfaces, which are interfaces 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 in clockwise order from the top.

[0014] The beneficial effects of the utility model are as follows: when a gas sample is directly sampled, quantitative analysis can be performed on it by the internal standard method to improve the accuracy of the analysis result; the automatic addition amount of the internal standard sample is more accurate; at the same time, the workload of the experimenter's manual operation is reduced; a double quantitative ring structure is designed, in which one quantitative ring is used as an internal standard quantitative ring and the other quantitative ring is used as a quantitative ring for the analyzed sample; the two quantitative rings are respectively mounted on two two-position six-way valves; the filling and injection of the sample are achieved by switching the six-way valves; after the two quantitative rings are filled with the internal standard gas and the sample gas respectively, the internal standard gas and the sample gas are simultaneously brought into the detection equipment for analysis through the chromatographic carrier gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a schematic diagram of the working state structure of the gas sampling device capable of automatically adding an internal standard of the present invention;

[0016] Figure 2 Shown is a schematic diagram of another working state structure of the gas sampling device capable of automatically adding internal standards of the present invention.

[0017] Explanation of the accompanying symbols: 1. Internal standard solenoid valve; 2. Internal standard two-position six-way valve; 3. Internal standard quantitative ring; 4. Internal standard gas flow limiting ring; 5. Sampling vacuum pump; 6. Sampling solenoid valve; 7. Sample two-position six-way valve; 8. Sample quantitative ring; 9. Mass flow controller; 10. Sample selection valve. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] See also Figure 1-Figure 2 The utility model provides an embodiment: a gas sampling device that can automatically add an internal standard, including a two-position six-way valve 2 for internal standard and a two-position six-way valve 7 for sample; also including an internal standard quantitative ring 3, a sample quantitative ring 8 and a sample selection valve 10; the internal standard quantitative ring 3 is installed in the internal standard two-position six-way valve 2; the sample quantitative ring 8 is installed in the sample two-position six-way valve 7; the internal standard solenoid valve 1 and the internal standard gas flow limiting ring 4 are installed on the upper interfaces at the left and right ends of the internal standard two-position six-way valve 2 respectively; the sampling solenoid valve 6 and the sampling vacuum pump 5 are installed on the lower interface at the right end of the sample two-position six-way valve 7; the mass flow controller 9 and the sample selection valve 10 are installed on the lower interface at the left end of the sample two-position six-way valve 7.

[0020] Among them, the internal standard two-position six-way valve 2 is provided with 6 interfaces, which are 1, 2, 3, 4, 5 and 6 interfaces in clockwise order from the lower left; the sample two-position six-way valve 7 is provided with 6 interfaces, which are 1, 2, 3, 4, 5 and 6 interfaces in counterclockwise order from the upper left.

[0021] At the same time, the 6th interface of the internal standard two-position six-way valve 2 is connected to the 1th interface of the sample two-position six-way valve 7; the 6th interface of the sample two-position six-way valve 7 is connected to the GC inlet; the 1th interface of the internal standard two-position six-way valve 2 is connected to the GC carrier gas; the internal standard solenoid valve 1 is connected to the 3th interface of the internal standard two-position six-way valve 2; the internal standard gas flow limiting ring 4 is connected to the 4th interface of the internal standard two-position six-way valve 2.

[0022] In addition, the sampling solenoid valve 6 and the sampling vacuum pump 5 are connected to the 4th interface of the sample two-position six-way valve 7; the mass flow controller 9 and the sample selection valve 10 are connected to the 3rd interface of the sample two-position six-way valve 7; the sample selection valve 10 is provided with 10 interfaces, which are 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 interfaces in clockwise order from the top.

[0023] When working, when gas samples need to be analyzed, Figure 1 The internal standard two-position six-way valve 2 and the sample two-position six-way valve 7 are shown in the states shown. At this time, the two ends of the internal standard quantitative loop 3 are respectively connected to the 3rd interface and the 4th interface of the internal standard two-position six-way valve 2, and the two ends of the sample quantitative loop 8 are respectively connected to the 3rd interface and the 4th interface of the sample two-position six-way valve 7. Further, the internal standard solenoid valve 1 is opened to fill the internal standard quantitative loop 3 with internal standard gas, and further, the internal standard gas flow limiting ring 4 limits the flow through the quantitative loop, thereby saving the internal standard gas. Further, the sample selection valve 10 is rotated to the position where the sample is connected, the sampling solenoid valve 6 is opened, the sampling vacuum pump 5 starts working, and the mass flow controller 9 controls the gas flow through the sample quantitative loop 8. Further, when the internal standard quantitative loop 3 and the sample quantitative loop 8 are full, the internal standard two-position six-way valve 2 and the sample two-position six-way valve 7 are switched to Figure 2 In the position shown, the two ends of the internal standard quantitative loop 3 are connected to the 1st interface and the 6th interface of the internal standard two-position six-way valve 2, and the two ends of the sample quantitative loop 8 are connected to the 1st interface and the 6th interface of the sample two-position six-way valve 7. At this time, the gas in the internal standard quantitative loop 3 and the sample quantitative loop 8 is brought into the gas chromatograph by the chromatographic carrier gas for analysis. After the injection is completed, the internal standard two-position six-way valve 2 and the sample two-position six-way valve 7 are switched back to Figure 1 The analysis process of the next sample is continued until all samples are analyzed.

[0024] Through the above steps, a double quantitative loop structure is designed, in which one quantitative loop serves as an internal standard quantitative loop and the other quantitative loop serves as a quantitative loop for the sample to be analyzed. The two quantitative loops are respectively installed on two two-position six-way valves. The filling and injection of the sample are achieved by switching the six-way valves. After the two quantitative loops are filled with internal standard gas and sample gas respectively, the internal standard gas and sample gas are simultaneously brought into the detection equipment for analysis through the chromatographic carrier gas to solve the problem that it can only be applied to the external standard method and the internal standard can only be added manually.

[0025] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the present invention.

Claims

1. A gas sampling device capable of automatically adding an internal standard, comprising a two-position six-way valve (2) for the internal standard and a two-position six-way valve (7) for the sample; characterized in that: The invention also comprises an internal standard quantitative ring (3), a sample quantitative ring (8) and a sample selection valve (10); the internal standard quantitative ring (3) is installed in the internal standard two-position six-way valve (2); the sample quantitative ring (8) is installed in the sample two-position six-way valve (7); the internal standard solenoid valve (1) and the internal standard gas flow limiting ring (4) are installed at the upper interfaces on the left and right ends of the internal standard two-position six-way valve (2); the sampling solenoid valve (6) and the sampling vacuum pump (5) are installed at the lower interface on the right end of the sample two-position six-way valve (7); and the mass flow controller (9) and the sample selection valve (10) are installed at the lower interface on the left end of the sample two-position six-way valve (7).

2. The gas sampling device capable of automatically adding an internal standard according to claim 1, wherein: The internal standard two-position six-way valve (2) is provided with six interfaces, which are interfaces 1, 2, 3, 4, 5 and 6 in clockwise order from the lower left.

3. The gas sampling device capable of automatically adding an internal standard according to claim 2, wherein: The sample two-position six-way valve (7) is provided with six interfaces, which are interfaces 1, 2, 3, 4, 5 and 6 in counterclockwise order from the upper left.

4. The gas sampling device capable of automatically adding an internal standard according to claim 3, wherein: The 6th interface of the internal standard two-position six-way valve (2) is connected to the 1st interface of the sample two-position six-way valve (7); the 6th interface of the sample two-position six-way valve (7) is connected to the GC injection port; and the 1st interface of the internal standard two-position six-way valve (2) is connected to the GC carrier gas.

5. The gas sampling device capable of automatically adding an internal standard according to claim 2, wherein: The internal standard solenoid valve (1) is connected to the 3rd interface of the internal standard two-position six-way valve (2); and the internal standard gas flow limiting ring (4) is connected to the 4th interface of the internal standard two-position six-way valve (2).

6. The gas sampling device capable of automatically adding an internal standard according to claim 3, characterized in that: The sampling solenoid valve (6) and the sampling vacuum pump (5) are connected to the 4th interface of the sample two-position six-way valve (7); the mass flow controller (9) and the sample selection valve (10) are connected to the 3rd interface of the sample two-position six-way valve (7).

7. The gas sampling device capable of automatically adding an internal standard according to claim 1, characterized in that: The sample selection valve (10) is provided with 10 interfaces, which are interfaces 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10 in clockwise order from the top.

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