Liquid sampling device of gas chromatograph

Abstract

The utility model discloses a liquid sample introduction device of a gas chromatograph, which comprises a support frame, a liquid storage box is assembled in the support frame, a liquid control component is assembled in the liquid storage box, the liquid control component comprises a first liquid inlet pipe, the first liquid inlet pipe is fixedly connected to the bottom of the liquid storage box, an inner liquid pipe is embedded in the first liquid inlet pipe, and the inner liquid pipe is fixedly connected to the bottom of the liquid storage box. And a second liquid inlet pipe is fixedly connected between the side wall of the first liquid inlet pipe and the liquid storage box. And according to the data condition output by the gas chromatograph, judging whether to continuously inject the sample or not. If the data display is normal, the sample size of the liquid sample is increased through the liquid control assembly, so that the gas chromatograph can comprehensively analyze the liquid sample. On the contrary, if the data display is abnormal, the liquid suction pump is started, the liquid sample in the liquid storage box and the liquid control assembly is discharged in time, excessive liquid is prevented from entering the chromatograph, and therefore adverse effects on equipment are avoided.

Description

Technical Field

[0001] This utility model relates to the field of chromatography technology, specifically to a liquid injection device for a gas chromatograph. Background Technology

[0002] A gas chromatograph (GC) is an instrument that uses chromatographic separation and detection techniques to perform qualitative and quantitative analysis on complex mixtures containing multiple components. The use of a GC involves not only the chromatographic analysis of gas samples but also the chromatographic analysis of liquid samples. However, current GCs cannot necessarily analyze all types of liquid samples. Currently, liquid samples are mostly injected directly into the GC. If the injected liquid sample is of a type that the GC cannot analyze, it will lead to difficult-to-clean residues inside the instrument and may interfere with the instrument's parameter data. Therefore, we propose a liquid injection device for a gas chromatograph. Utility Model Content

[0003] The purpose of this invention is to provide a liquid injection device for a gas chromatograph to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a liquid injection device for a gas chromatograph, comprising a support frame, a liquid storage box being assembled inside the support frame, and a liquid control component being assembled inside the liquid storage box;

[0005] The liquid control assembly includes a first liquid inlet pipe, which is fixedly connected to the bottom of the liquid storage box. An inner liquid pipe is embedded in the first liquid inlet pipe. A second liquid inlet pipe is fixedly connected between the side wall of the first liquid inlet pipe and the liquid storage box. An air pump is fixedly installed on the top of the liquid storage box. A first control valve and a second control valve are fixedly installed in the first liquid inlet pipe and the second liquid inlet pipe, respectively.

[0006] Preferably, a drain pipe is fixedly connected to the bottom of the liquid storage box, a third control valve is fixedly installed inside the drain pipe, and a suction pump is fixedly installed on the side wall of the support frame, with the input end of the suction pump fixedly connected to the output end of the drain pipe.

[0007] Preferably, the liquid storage box includes a box body, the top of which is integrally formed with a liquid inlet, and a cap is screwed onto the top of the liquid inlet.

[0008] Preferably, the sidewall of the cover is uniformly provided with anti-slip texture, and a rubber pad is embedded inside the cover.

[0009] Preferably, the support frame includes a frame body, the top of the frame body has a slot, and the bottom four corners of the frame body are fixedly fitted with support legs.

[0010] Compared with existing technologies, the beneficial effects of this utility model are as follows: A liquid injection device for a gas chromatograph, which includes a liquid control component. First, by operating the control valve in the liquid control component, a small amount of liquid sample is delivered to the gas chromatograph via an internal liquid tube. Then, based on the data output by the gas chromatograph, it is determined whether to continue injection. If the data is normal, the injection volume of the liquid sample is increased via the liquid control component so that the gas chromatograph can comprehensively analyze the liquid sample. Conversely, if the data is abnormal, the aspiration pump is activated to promptly discharge the liquid sample from the reservoir and the liquid control component, preventing excessive liquid from entering the chromatograph and thus avoiding adverse effects on the equipment. Attached Figure Description

[0011] Figure 1 This is a perspective view of the present invention.

[0012] Figure 2 This is a schematic diagram of the structure of this utility model.

[0013] Figure 3 for Figure 2 Detailed image of point a in the image.

[0014] Figure 4 This is a schematic diagram of the structure of the first liquid inlet pipe and the inner liquid pipe of this utility model.

[0015] In the diagram: 1. Support frame; 11. Frame body; 12. Slot; 13. Support leg; 2. Liquid storage box; 21. Box body; 22. Injection port; 23. Cap; 3. Liquid control assembly; 31. First inlet pipe; 32. Inner liquid pipe; 33. Second inlet pipe; 34. First control valve; 35. Second control valve; 36. Air pump; 37. Suction pump; 38. Drain pipe; 39. Third control valve; 4. Anti-slip texture; 5. Rubber pad. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0017] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 This utility model provides a technical solution: a liquid injection device for a gas chromatograph, including a support frame 1, a liquid storage box 2 fixedly connected inside the support frame 1, the support frame 1 being used to connect and fix to the top of the chromatograph, the liquid storage box 2 being used to store the liquid sample entering the chromatograph, and a liquid control component 3 being fixedly assembled inside the liquid storage box 2, the liquid sample added to the chromatograph being controlled by the liquid control component 3.

[0018] like Figure 1As shown, the support frame 1 includes a frame body 11. The top of the frame body 11 is provided with a slot 12, which is adapted to the size of the liquid storage box 2. The slot 12 is used for snapping and fixing the liquid storage box 2. Support legs 13 are welded and fixed at the four corners of the bottom of the frame body 11. The support legs 13 are detachably fixed to the chromatograph by fixing bolts.

[0019] like Figure 2 and Figure 3 As shown, the liquid storage box 2 includes a box body 21, a liquid storage cavity is provided inside the box body 21, and an injection port 22 connected to the liquid storage cavity is fixedly connected to the top of the box body 21. A cap 23 is screwed to the top of the injection port 22, and the injection port 22 is sealed by the cap 23.

[0020] The sidewall of the cap 23 is evenly provided with anti-slip texture 4. The anti-slip texture 4 increases the friction for gripping the cap 23. A rubber pad 5 is embedded in the cap 23. The rubber pad 5 seals the cap 23 and the injection port 22, improving the sealing performance of the cap 23 to the injection port 22.

[0021] like Figure 2 and Figure 4 As shown, the liquid control assembly 3 includes a first inlet pipe 31, which is fixedly connected to the bottom of the storage box 2. An inner liquid pipe 32 is fixedly connected to the inner cavity of the first inlet pipe 31. The first inlet pipe 31 is inserted into the sample inlet of the chromatograph. A second inlet pipe 33 is fixedly connected between the bottom of the storage box 2 and the first inlet pipe 31. A first control valve 34 and a second control valve 35 are respectively fixedly installed in the first inlet pipe 31 and the second inlet pipe 33. The first control valve 34 and the second control valve 35 are electrically... The system is connected to an external power source and an external controller. The first control valve 34 and the second control valve 35 are solenoid valves, which can be controlled to open and close by the external controller. An air pump 36 is fixedly mounted on the top of the liquid storage box 2. The air pump 36 is electrically connected to the external power source. The output end of the air pump 36 is inserted into the liquid storage box 2. Air is introduced into the liquid storage box 2 through the air pump 36. After the air enters the liquid storage box 2, the liquid sample in the liquid storage box 2 is introduced into the chromatograph through the first inlet pipe 31 and the second inlet pipe 33.

[0022] The injection volume of the first inlet tube 31 into the chromatograph is controlled by opening and closing the first control valve 34 and the second control valve 35. Since the gas chromatograph has limitations in testing liquid samples and cannot test and analyze all liquid samples, after the liquid sample is added into the reservoir 2, the first control valve 34 is opened first, and a small amount of sample is injected into the chromatograph through the inner liquid tube 32. After the second control valve 35 is opened, the second inlet tube 33 can cooperate with the first inlet tube 31 to increase the injection volume of the liquid sample into the chromatograph.

[0023] A drain pipe 38 is fixedly connected to the bottom of the liquid storage box 2. A suction pump 37 is fixedly installed on the side wall of the support frame 1. The suction pump 37 is fixedly connected to the output end of the drain pipe 38. A third control valve 39 is fixedly installed inside the drain pipe 38. The third control valve 39 and the suction pump 37 are also electrically connected to an external power supply and an external controller. After the third control valve 39 and the suction pump 37 are energized and opened, the suction pump 37 discharges the liquid sample in the liquid storage box 2 outward through the drain pipe 38.

[0024] Working Principle: This device mainly applies the injection of liquid samples into the gas chromatograph. When the gas chromatograph cannot effectively analyze the liquid sample, this device can control the liquid sample to be discharged from the reservoir 2 through the drain pipe 38. During use, the liquid sample to be analyzed is added into the reservoir 2 through the injection port 22. The cap 23 seals the injection port 22, and a rubber gasket 5 is provided to improve the overall airtightness of the reservoir 2. First, the first control valve 34 is opened, the second control valve 35 and the third control valve 39 are closed, and the air pump 36 is turned on. After air is injected into the reservoir 2, a small amount of liquid sample can be injected into the gas chromatograph through the inner liquid pipe 32. After the sample is inserted into the chromatograph, observe the test data displayed on the chromatograph to check if the baseline is stable and if there are any ghost peaks. If the test results are stable, the second control valve 35 can be opened to connect the second inlet pipe 33 with the first inlet pipe 31. The flow rate of the liquid sample entering the chromatograph is increased through the second inlet pipe 33 to ensure the smooth testing of the liquid sample. If the test results are unstable, the air pump 36 is turned off, and the third control valve 39 and the aspiration pump 37 are opened at the same time. The aspiration pump 37 discharges the liquid sample remaining in the reservoir 2, the first inlet pipe 31 and the second inlet pipe 33 through the drain pipe 38 to empty the liquid sample in the reservoir 2 in a timely manner.

Claims

1. A liquid injection device for a gas chromatograph, characterized in that: Includes a support frame (1), wherein a liquid storage box (2) is installed inside the support frame (1), and a liquid control component (3) is installed inside the liquid storage box (2); The liquid control assembly (3) includes a first liquid inlet pipe (31), which is fixedly connected to the bottom of the liquid storage box (2). An inner liquid pipe (32) is embedded in the first liquid inlet pipe (31). A second liquid inlet pipe (33) is fixedly connected between the side wall of the first liquid inlet pipe (31) and the liquid storage box (2). An air pump (36) is fixedly installed on the top of the liquid storage box (2). A first control valve (34) and a second control valve (35) are fixedly installed in the first liquid inlet pipe (31) and the second liquid inlet pipe (33), respectively.

2. The liquid injection device for a gas chromatograph according to claim 1, characterized in that: The bottom of the liquid storage box (2) is fixedly connected to a drain pipe (38), a third control valve (39) is fixedly installed inside the drain pipe (38), and a suction pump (37) is fixedly installed on the side wall of the support frame (1). The input end of the suction pump (37) is fixedly connected to the output end of the drain pipe (38).

3. The liquid injection device for a gas chromatograph according to claim 1, characterized in that: The liquid storage box (2) includes a box body (21), and the top of the box body (21) is integrally formed with a liquid inlet (22), and a cap (23) is screwed onto the top of the liquid inlet (22).

4. The liquid injection device for a gas chromatograph according to claim 3, characterized in that: The sidewall of the cover (23) is uniformly provided with anti-slip texture (4), and a rubber pad (5) is embedded in the cover (23).

5. A liquid injection device for a gas chromatograph according to claim 1, characterized in that: The support frame (1) includes a frame body (11), the top of the frame body (11) is provided with a slot (12), and the bottom four corners of the frame body (11) are fixedly fitted with support legs (13).

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