Standard gas quantitative sampling device for gas chromatograph

Abstract

The utility model discloses a standard gas quantitative sample introduction device for gas chromatograph, including sample introduction device main part, sample introduction port, vaporizing chamber and quantitative tube, sample introduction port is provided in the top of sample introduction device main part, and the central position in sample introduction device main part is provided with liner tube, the vaporizing chamber is provided in the liner tube, quantitative tube is provided in the vaporizing chamber. A gas outlet is formed in the sampling device main body below the vaporizing chamber, a quantitative pipe is arranged at the bottom end of the sampling device main body through a bracket, an electromagnetic valve is arranged at the bottom end of the quantitative pipe, the bottom end of one side of the quantitative pipe is connected with the gas outlet through a gas guide pipe, and a gas flow control valve is arranged on the gas guide pipe. According to the utility model, the sample introduction device main body, the sample introduction port, the gas outlet, the quantitative pipe, the gas flow control valve, the gas guide pipe, the electromagnetic valve, the piston push plate and the micro cylinder are arranged, and the bottom end of the quantitative pipe is communicated with a chromatographic column of a gas chromatograph, so that standard gas can be quantitatively introduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gas chromatograph sample injection devices, in particular to a standard gas quantitative sample injection device for a gas chromatograph. Background Art

[0002] Gas chromatograph is an instrument that uses chromatographic separation and detection technology to perform qualitative and quantitative analysis on complex mixtures of multiple components. Chromatographic standard gas is a gas mixture, usually composed of two or more known components, and is used for calibration and quantitative analysis of analytical instruments such as chromatographs.

[0003] When injecting chromatographic standard gas, the standard gas is generally introduced through the injection port, and the volatile components are evaporated from the sample matrix by heating. Then, the standard gas enters the chromatographic column of the gas chromatograph for chromatographic analysis. Although the standard gas can be automatically introduced when entering the chromatographic column, it is usually impossible to accurately measure the amount of gas entering, which can easily affect the test results. Utility Model Content

[0004] The utility model aims to provide a standard gas quantitative sampling device for a gas chromatograph to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a standard gas quantitative sampling device for a gas chromatograph, comprising a sampling device body, a sampling port, a vaporization chamber and a quantitative tube, the top of the sampling device body is provided with a sampling port, and a liner is provided at a central position inside the sampling device body, a vaporization chamber is provided inside the liner, and a carrier gas channel and a purge outlet are provided at the tops of both sides of the sampling device body, respectively, a diversion outlet is provided on the sampling device body below the purge outlet, a gas outlet is provided in the sampling device body below the vaporization chamber, the gas outlet is connected with the vaporization chamber, a quantitative tube is provided at the bottom end of the sampling device body through a bracket, and a solenoid valve is provided at the bottom end of the quantitative tube, the bottom end of one side of the quantitative tube is connected to the gas outlet through an air guide tube, and a gas flow control valve is provided on the air guide tube.

[0006] Preferably, a mounting groove is provided on the top side of the injection port, and a spacer is embedded in the mounting groove.

[0007] Preferably, a sampling cap is provided on the top of the sampling port, and a through hole is opened at the central position of the top of the sampling cap.

[0008] Preferably, the spacer is made of silicone material, and limiting blocks are arranged around the spacer, and limiting grooves matching the limiting blocks are evenly opened inside the installation groove.

[0009] Preferably, heating resistance rings are provided at both ends of the liner tube, and the liner tube is symmetrically distributed.

[0010] Preferably, heat-conducting rings are evenly distributed at the central position inside the liner, and the heat-conducting rings are evenly connected to the heating resistance rings through heat-conducting rods.

[0011] Preferably, a piston push plate is provided inside the quantitative tube, and a micro cylinder is fixed on the top of the quantitative tube, and the output end of the micro cylinder is connected to the piston push plate through a telescopic column.

[0012] Preferably, the heat-conducting ring is evenly hooped on the outer wall of the vaporization chamber, and the heat-conducting ring and the heat-conducting rod are both made of copper alloy.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] (1) The standard gas quantitative injection device for gas chromatograph is equipped with an injection device body, an injection port, a gas outlet, a quantitative tube, a gas flow control valve, an air guide tube, an electromagnetic valve, a piston push plate and a micro cylinder. The bottom end of the quantitative tube is connected to the chromatographic column of the gas chromatograph. The standard gas enters through the injection port and enters the quantitative tube through the air guide tube. The gas flow control valve is used to sense the amount of standard gas entering. When the set value is reached, the electromagnetic valve is controlled to open through the control system. At the same time, the micro cylinder drives the piston push plate to move downward through the telescopic column, and presses the gas into the chromatographic column for relevant detection, which is beneficial to the quantitative introduction of standard gas and improves the accuracy of the detection result.

[0015] (2) The standard gas quantitative sampling device for gas chromatograph is equipped with a liner, a vaporization chamber, a heating resistor ring, a heat-conducting ring and a heat-conducting rod. When the heating resistor ring is energized, heat is generated, and the heat is evenly transferred to the heat-conducting ring through the heat-conducting rod. The heat-conducting ring is evenly clamped on the outer wall of the vaporization chamber, which is beneficial to uniformly and quickly increase the temperature in the vaporization chamber while reducing the number of heating resistor rings, so as to volatilize the volatile components in the standard gas, thereby playing a role in energy saving and emission reduction.

[0016] (3) The standard gas quantitative injection device for the gas chromatograph is installed with a septum, which is embedded in the installation groove on the outside of the injection port. Limit blocks are arranged around the septum, and the inner wall of the installation groove is evenly provided with limit grooves corresponding to the limit blocks, so that the septum is convenient to be inserted and the stability of the septum after installation is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view cross-sectional structural schematic diagram of the utility model;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the quantitative tube of the utility model;

[0019] Figure 3 For the utility model Figure 1 The enlarged structural diagram at A in the middle;

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the liner pipe of the utility model from top view;

[0021] Figure 5 It is a schematic diagram of the top view structure of the injection port of the utility model.

[0022] In the figure: 1. Injection device body; 2. Injection port; 3. Septum; 4. Carrier gas channel; 5. Purge outlet; 6. Liner; 7. Diversion outlet; 8. Vaporization chamber; 9. Gas outlet; 10. Quantitative tube; 11. Gas flow control valve; 12. Gas guide tube; 13. Solenoid valve; 14. Piston push plate; 15. Micro cylinder; 16. Heat conduction ring; 17. Heat conduction rod; 18. Heating resistor ring; 19. Limit groove; 20. Limit block; 21. Installation groove. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-5 The utility model provides an embodiment: a standard gas quantitative sampling device for a gas chromatograph, comprising a sampling device body 1, a sampling port 2, a vaporization chamber 8 and a quantitative tube 10, wherein the sampling device body 1 is provided with the sampling port 2 at the top thereof, and a liner 6 is provided at the central position inside the sampling device body 1, and the liner 6 is provided with the vaporization chamber 8 inside;

[0025] Heating resistor rings 18 are provided at both ends of the liner 6, and the liner 6 is symmetrically distributed;

[0026] Heat-conducting rings 16 are evenly distributed at the central position inside the liner 6, and the heat-conducting rings 16 are evenly connected to the heating resistor rings 18 through heat-conducting rods 17, and the heat-conducting rings 16 are evenly hooped on the outer wall of the vaporization chamber 8;

[0027] The standard gas enters the gasification chamber 8 through the injection port 2. A mounting groove 21 is provided on the top side of the injection port 2, and a septum 3 is embedded inside the mounting groove 21 to increase the sealing performance of the injection port 2.

[0028] The spacer 3 is made of silicone material, and the spacer 3 is provided with limit blocks 20 around it. The interior of the installation groove 21 is evenly provided with limit grooves 19 matching the limit blocks 20, so that the spacer 3 can be inserted easily and the stability of the spacer 3 after installation can be increased.

[0029] A sampling cap 22 is provided at the top of the sampling port 2, and a through hole is opened at the center of the top of the sampling cap 22 for pressing the septum 3;

[0030] When the heating resistor ring 18 in the liner tube 6 is energized, it generates heat to volatilize the volatile components in the standard gas;

[0031] The heat is evenly transferred to the heat-conducting ring 16 through the heat-conducting rod 17. The heat-conducting ring 16 is evenly hooped on the outer wall of the vaporization chamber 8, which is conducive to reducing the number of heating resistor rings 18 so that the temperature in the vaporization chamber 8 can be evenly and quickly increased, thereby playing a role in energy saving and emission reduction. The heat-conducting ring 16 and the heat-conducting rod 17 are both made of copper alloy to improve the heat transfer efficiency;

[0032] A gas outlet 9 is provided in the sample injection device body 1 below the gasification chamber 8, and the gas outlet 9 is connected to the gasification chamber 8. A quantitative tube 10 is provided at the bottom end of the sample injection device body 1 through a bracket.

[0033] A solenoid valve 13 is provided at the bottom end of the quantitative tube 10, and the bottom end of one side of the quantitative tube 10 is connected to the gas outlet 9 through an air guide tube 12, and a gas flow control valve 11 is provided on the air guide tube 12;

[0034] A piston push plate 14 is provided inside the quantitative tube 10, and a micro cylinder 15 is fixed on the top of the quantitative tube 10, and the output end of the micro cylinder 15 is connected to the piston push plate 14 through a telescopic column;

[0035] The gas then enters the quantitative tube 10 through the air guide tube 12. The gas flow control valve 11 is used to sense the amount of standard gas entering. When the set value is reached, the control system controls the solenoid valve 13 to open. At the same time, the micro cylinder 15 drives the piston push plate 14 to move downward through the telescopic column, and the gas is pressed into the chromatographic column for relevant detection, which is conducive to the quantitative introduction of standard gas and improves the accuracy of the detection results.

[0036] The tops of both sides of the sample injection device body 1 are respectively provided with a carrier gas channel 4 and a purge outlet 5. After the gas is introduced through the carrier gas channel 4, the dirt on the septum 3 can be purged and discharged through the purge outlet 5. The sample injection device body 1 below the purge outlet 5 is provided with a diversion outlet 7 for draining excess gas.

[0037] The specific models and specifications of the gas flow control valve 11, micro cylinder 15, heating resistor ring 18 and solenoid valve 13 need to be determined by selection calculation based on the specification parameters of the device. The selection calculation method is existing technology, so it will not be described in detail.

[0038] Working principle: When the embodiment of the present application is in use, the bottom end of the quantitative tube 10 is connected to the chromatographic column of the gas chromatograph, and the standard gas enters the vaporization chamber 8 through the sample inlet 2. The heating resistor ring 18 in the liner tube 6 generates heat after being energized. The heat is evenly transferred to the heat-conducting ring 16 through the heat-conducting rod 17. The heat-conducting ring 16 is evenly hooped on the outer wall of the vaporization chamber 8, which is conducive to reducing the number of heating resistor rings 18. The temperature in the vaporization chamber 8 can be evenly and quickly increased, and the volatile components in the standard gas can be volatilized, which plays a role in energy saving and emission reduction. The gas then enters the quantitative tube 10 through the gas guide tube 12, and the gas flow control The control valve 11 is used to sense the amount of standard gas entering. When the set value is reached, the solenoid valve 13 is controlled to open through the control system. At the same time, the micro cylinder 15 drives the piston push plate 14 to move downward through the telescopic column, and the gas is pressed into the chromatographic column for relevant detection, which is conducive to the quantitative introduction of standard gas and improves the accuracy of the test results. An installation groove 21 is provided on the top side of the injection port 2, and a gasket 3 is arranged in the installation groove 21 to increase the sealing of the injection port 2. Limit blocks 20 are arranged around the gasket 3, and the inner side wall of the installation groove 21 is evenly provided with limit grooves 19 corresponding to the limit blocks 20, which facilitates the insertion of the gasket 3 and increases the stability of the gasket 3 after installation.

Claims

1. A standard gas quantitative sampling device for gas chromatograph, characterized in that: The invention comprises a sampling device body (1), a sampling port (2), a vaporization chamber (8) and a quantitative tube (10), wherein the sampling device body (1) is provided with a sampling port (2) at the top end, a liner (6) is provided at the central position inside the sampling device body (1), a vaporization chamber (8) is provided inside the liner (6), and the top ends of both sides of the sampling device body (1) are respectively provided with a carrier gas channel (4) and a purge outlet (5), and a separation gas chamber (8) is provided on the sampling device body (1) below the purge outlet (5). A gas outlet (7) is provided in the sampling device body (1) below the gasification chamber (8), and the gas outlet (9) is communicated with the gasification chamber (8). A quantitative tube (10) is provided at the bottom end of the sampling device body (1) through a bracket, and a solenoid valve (13) is provided at the bottom end of the quantitative tube (10). The bottom end of one side of the quantitative tube (10) is connected to the gas outlet (9) through an air guide tube (12), and a gas flow control valve (11) is provided on the air guide tube (12).

2. The standard gas quantitative sampling device for gas chromatograph according to claim 1, characterized in that: A mounting groove (21) is provided on the top side of the injection port (2), and a spacer (3) is embedded in the mounting groove (21).

3. The standard gas quantitative sampling device for gas chromatograph according to claim 1, characterized in that: A sampling cap (22) is arranged at the top of the sampling port (2), and a through hole is opened at the central position of the top of the sampling cap (22).

4. The standard gas quantitative sampling device for gas chromatograph according to claim 2, characterized in that: The spacer (3) is made of silica gel, and limit blocks (20) are arranged around the spacer (3), and limit grooves (19) matching the limit blocks (20) are evenly opened inside the installation groove (21).

5. The standard gas quantitative sampling device for gas chromatograph according to claim 1, characterized in that: Heating resistance rings (18) are provided at both ends of the interior of the liner tube (6), and the liner tube (6) is symmetrically distributed.

6. A standard gas quantitative sampling device for gas chromatograph according to claim 5, characterized in that: Heat-conducting rings (16) are evenly distributed at the central position inside the liner (6), and the heat-conducting rings (16) are evenly connected to heating resistance rings (18) through heat-conducting rods (17).

7. The standard gas quantitative sampling device for gas chromatograph according to claim 1, characterized in that: A piston push plate (14) is arranged inside the quantitative tube (10), and a micro cylinder (15) is fixed on the top of the quantitative tube (10), and the output end of the micro cylinder (15) is connected to the piston push plate (14) via a telescopic column.

8. The standard gas quantitative sampling device for gas chromatograph according to claim 6, characterized in that: The heat-conducting ring (16) is evenly hooped on the outer wall of the gasification chamber (8), and the heat-conducting ring (16) and the heat-conducting rod (17) are both made of copper alloy.

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