Liquid phase sample preparation device under protection of inert gas

Abstract

The utility model provides a liquid-phase sample preparation device under inert gas protection, and the device comprises a gas conveying pipe which is provided with a first valve; the first sample bottle is communicated with the first gas inlet pipe and the first liquid outlet pipe; an inlet of the first three-way reversing valve is communicated with a gas conveying pipe through a first branch pipe, a first outlet is communicated with a first gas inlet pipe, a second outlet is communicated with a first discharge pipe, and the first discharge pipe is communicated with a first liquid outlet pipe; an inlet of the second three-way reversing valve communicates with the first discharge pipe, a first outlet communicates with the first conveying pipe, and a second outlet communicates with the first waste liquid pipe; the second sample bottle is communicated with the second gas inlet pipe and the second liquid outlet pipe; an inlet of the third three-way reversing valve is communicated with the gas conveying pipe through a second branch pipe, a first outlet is communicated with a second gas inlet pipe, a second outlet is communicated with a second discharge pipe, and the second discharge pipe is communicated with a second liquid outlet pipe; an inlet of the fourth three-way reversing valve communicates with a second discharge pipe, a first outlet communicates with a second conveying pipe, and a second outlet communicates with a second waste liquid pipe; the receiving bottle is communicated with the first conveying pipe and the second conveying pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical analysis, in particular to a liquid phase sample preparation device under the protection of inert gas. Background Art

[0002] In analytical testing, the properties of the analytes vary widely. Many cannot be directly analyzed and require pretreatment. For samples containing chemically active or easily oxidized components, or samples susceptible to interference from air or moisture, inert gas protection and other protective measures to remove oxygen, water, and air are required during sample processing. Inert gas is generally used as an inert shielding gas, and related operations are performed in an inert gas atmosphere to create an oxygen- and water-free environment.

[0003] Commonly used inert gas glove boxes utilize inert gas to displace oxygen and moisture within the sealed chamber, allowing for easy access to the chamber through the use of sealed rubber gloves. For weighing, pipetting, and preparation, balances, reagents, and other equipment must be placed in the box in advance. This increases the size and sealing requirements of the box, as well as the volume. This increases the time required to replace the inert gas, adding both labor and time to analytical operations. Utility Model Content

[0004] In view of this, the utility model provides a liquid sample preparation device under the protection of inert gas to solve the above technical problems.

[0005] The liquid sample preparation device under inert gas protection provided by the utility model comprises:

[0006] a gas pipeline, wherein a first valve is installed on the gas pipeline;

[0007] a first sample bottle, wherein the first sample bottle is connected to a first air inlet pipe and a first liquid outlet pipe, and the first air inlet pipe is higher than the first liquid outlet pipe;

[0008] a first three-way reversing valve, wherein the inlet of the first three-way reversing valve is connected to the gas delivery pipe via a first branch pipe, and a second valve is installed on the first branch pipe, a first outlet of the first three-way reversing valve is connected to the first gas inlet pipe, a second outlet of the first three-way reversing valve is connected to a first discharge pipe, and the first discharge pipe is connected to the first liquid outlet pipe;

[0009] a second three-way reversing valve, wherein the inlet of the second three-way reversing valve is connected to the first discharge pipe, the first outlet of the second three-way reversing valve is connected to the first delivery pipe, and the second outlet of the second three-way reversing valve is connected to the first waste liquid pipe;

[0010] a second sample bottle, wherein the second sample bottle is connected to a second air inlet pipe and a second liquid outlet pipe, and the second air inlet pipe is higher than the second liquid outlet pipe;

[0011] a third three-way reversing valve, wherein the inlet of the third three-way reversing valve is connected to the gas delivery pipe via a second branch pipe, and a third valve is installed on the second branch pipe, the first outlet of the third three-way reversing valve is connected to the second gas inlet pipe, the second outlet of the third three-way reversing valve is connected to the second discharge pipe, and the second discharge pipe is connected to the second liquid outlet pipe;

[0012] a fourth three-way reversing valve, wherein the inlet of the fourth three-way reversing valve is connected to the second discharge pipe, the first outlet of the fourth three-way reversing valve is connected to the second delivery pipe, and the second outlet of the fourth three-way reversing valve is connected to the second waste liquid pipe;

[0013] A receiving bottle is connected to the first delivery pipe and the second delivery pipe, and the receiving bottle is connected to the discharge pipe.

[0014] Optionally, the liquid sample preparation device under inert gas protection further includes: an oxygen detector, which is arranged on the discharge pipe.

[0015] Optionally, a first mass flow meter is provided on the first discharge pipe.

[0016] Optionally, a second mass flow meter is provided on the second discharge pipe.

[0017] Optionally, the liquid sample preparation device under inert gas protection also includes: a controller, the input end of the controller is communicatively connected to the output ends of the oxygen detector, the first mass flowmeter and the second mass flowmeter, and the output end of the controller is communicatively connected to the control ends of the second valve, the third valve, the first three-way reversing valve and the third three-way reversing valve.

[0018] Optionally, the liquid sample preparation device under inert gas protection further includes: a waste liquid bottle, wherein the waste liquid bottle is connected to the first waste liquid pipe and the second waste liquid pipe.

[0019] Optionally, the first valve is configured as a pressure regulating valve.

[0020] Optionally, the liquid sample preparation device under inert gas protection further includes: a gas storage tank, which is connected to the gas pipe.

[0021] Optionally, a first pressure sensor is provided on the first branch pipe.

[0022] Optionally, a second pressure sensor is provided on the second branch pipe.

[0023] Compared with the prior art, the above technical solution provided by the present invention has at least the following beneficial effects:

[0024] The liquid sample preparation device under inert gas protection of the utility model does not need to occupy too much space, and the inert gas is replaced quickly. Compared with the operation time of the inert gas protection glove box in the prior art that often takes several hours, it can quickly complete the preparation and mixing of multiple liquid substances in a certain proportion under the inert gas protection state. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of a liquid sample preparation device under inert gas protection according to one embodiment of the present invention.

[0026] Reference numerals:

[0027] 1: gas pipe; 2: first sample bottle; 3: first three-way reversing valve; 4: second three-way reversing valve; 5: second sample bottle; 6: third three-way reversing valve; 7: fourth three-way reversing valve; 8: receiving bottle; 9: first valve; 10: first air inlet pipe; 11: first liquid outlet pipe; 12: first branch pipe; 13: second valve; 14: first discharge pipe; 15: first delivery pipe; 16: first waste liquid pipe; 17: second air inlet pipe; 18: second liquid outlet pipe; 19: second branch pipe; 20: third valve; 21: second discharge pipe; 22: second delivery pipe; 23: second waste liquid pipe; 24: discharge pipe; 25: oxygen detector; 26: first mass flowmeter; 27: second mass flowmeter; 28: waste liquid bottle. DETAILED DESCRIPTION

[0028] The embodiments of the present invention will be further described below with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0029] Figure 1 This is a schematic diagram of a liquid sample preparation device under inert gas protection according to one embodiment of the present invention.

[0030] like Figure 1As shown, the liquid sample preparation device under inert gas protection includes a gas transmission pipe 1, a first sample bottle 2, a first three-way reversing valve 3, a second three-way reversing valve 4, a second sample bottle 5, a third three-way reversing valve 6, a fourth three-way reversing valve 7 and a receiving bottle 8.

[0031] A first valve 9 is installed on the air supply pipe 1; the first sample bottle 2 is connected to the first air inlet pipe 10 and the first liquid outlet pipe 11, and the first air inlet pipe 10 is higher than the first liquid outlet pipe 11; the inlet of the first three-way reversing valve 3 is connected to the air supply pipe 1 through the first branch pipe 12, and the first branch pipe 12 is installed with a second valve 13, the first outlet of the first three-way reversing valve 3 is connected to the first air inlet pipe 10, the second outlet of the first three-way reversing valve 3 is connected to the first discharge pipe 14, and the first discharge pipe 14 is connected to the first liquid outlet pipe 11; the inlet of the second three-way reversing valve 4 is connected to the first discharge pipe 14, the first outlet of the second three-way reversing valve 4 is connected to the first delivery pipe 15, and the second outlet of the second three-way reversing valve 4 is connected to the first waste liquid pipe 16; the second sample bottle 5 is connected to the first There are two air inlet pipes 17 and a second liquid outlet pipe 18, and the second air inlet pipe 17 is higher than the second liquid outlet pipe 18; the inlet of the third three-way reversing valve 6 is connected to the air supply pipe 1 through the second branch pipe 19, and the third valve 20 is installed on the second branch pipe 19, the first outlet of the third three-way reversing valve 6 is connected to the second air inlet pipe 17, the second outlet of the third three-way reversing valve 6 is connected to the second discharge pipe 21, and the second discharge pipe 21 is connected to the second liquid outlet pipe 18; the inlet of the fourth three-way reversing valve 7 is connected to the second discharge pipe 21, the first outlet of the fourth three-way reversing valve 7 is connected to the second delivery pipe 22, and the second outlet of the fourth three-way reversing valve 7 is connected to the second waste liquid pipe 23; the receiving bottle 8 is connected to the first delivery pipe 15 and the second delivery pipe 22, and the receiving bottle 8 is connected to the discharge pipe 24.

[0032] When using this device for sample preparation, initially, the first valve 9, second valve 13, third valve 20, first three-way reversing valve 3, second three-way reversing valve 4, third three-way reversing valve 6, and fourth three-way reversing valve 7 are all closed. First, the inlet of the first three-way reversing valve 3 is connected to its second outlet, the inlet of the second three-way reversing valve 4 is connected to its first outlet, the inlet of the third three-way reversing valve 6 is connected to its second outlet, and the inlet of the fourth three-way reversing valve 7 is connected to its first outlet. The first valve 9, second valve 13, and third valve 20 are opened, and the opening of the first valve 9 is adjusted so that the gas pressure in the pipeline meets the system requirements. When inert gas is delivered through the gas delivery pipe 1, it enters the receiving bottle 8 via the first branch pipe 12, the first exhaust pipe 14, and the first delivery pipe 15, expelling air from the pipes during delivery. Similarly, inert gas enters the receiving bottle 8 via the second branch pipe 19, the second exhaust pipe 21, and the second delivery pipe 22, expelling air from the pipes during delivery. The exhausted air and inert gas from the pipes enter the receiving bottle 8 and are discharged to the outside through the exhaust pipe 24. After a certain period of inert gas delivery, the air in each pipe and the receiving bottle 8 is completely expelled and replaced by inert gas. At this time, the third valve 20 is closed, connecting the inlet of the first three-way reversing valve 3 to its first outlet. The inert gas then enters the first sample bottle 2 via the first branch pipe 12 and the first air inlet pipe 10. Under the pressure of the continuously injected inert gas, the liquid sample in the first sample bottle 2 is discharged through the first liquid outlet pipe 11 to the first exhaust pipe 14, and further output to the receiving bottle 8 through the first delivery pipe 15. After a certain amount of liquid sample in the first sample bottle 2 has been delivered to the receiving bottle 8, the second valve 13 is closed, the third valve 20 is opened, and the inlet of the third three-way reversing valve 6 is connected to its first outlet, and the inlet of the fourth three-way reversing valve 7 is connected to its first outlet. The inert gas then enters the second sample bottle 5 through the second branch pipe 19 and the second air inlet pipe 17. Under the pressure of the continuously injected inert gas, the liquid sample in the second sample bottle 5 is discharged through the second liquid outlet pipe 18 to the second discharge pipe 21, and further delivered to the receiving bottle 8 through the second delivery pipe 22. After a certain amount of liquid sample in the second sample bottle 5 has been delivered to the receiving bottle 8, the third valve 20 is closed, completing the preparation of the liquid sample.

[0033] In order to prevent the liquid sample in the pipeline from not completely entering the receiving bottle 8 after the liquid sample delivery is stopped, the inlet of the first three-way reversing valve 3 or the third three-way reversing valve 6 can be connected to the second outlet again after the liquid sample delivery is stopped, and the inert gas can be delivered to the first discharge pipe 14 or the second discharge pipe 21 again, thereby pushing the liquid sample remaining therein into the receiving bottle 8.

[0034] When the inert gas or liquid sample is no longer needed, the inlet of the second three-way reversing valve 4 can be connected to its second outlet, and the inlet of the fourth three-way reversing valve 7 can be connected to its second outlet. Then, the inert gas or liquid sample transported by the first discharge pipe 14 flows through the second three-way reversing valve 4 and is transported to the first waste liquid pipe 16 and discharged to the outside. At the same time, the inert gas or liquid sample transported by the second discharge pipe 21 flows through the fourth three-way reversing valve 7 and is transported to the second waste liquid pipe 23 and discharged to the outside.

[0035] The liquid sample preparation device under inert gas protection of the utility model does not need to occupy too much space, and the inert gas is replaced quickly. Compared with the operation time of the inert gas protection glove box in the prior art that often takes several hours, it can quickly complete the preparation and mixing of multiple liquid substances in a certain proportion under the inert gas protection state.

[0036] like Figure 1As shown, the first air inlet pipe 10 and the first liquid outlet pipe 11 are both inserted into the first sample bottle 2, and the height of the first air inlet pipe 10 at one end inside the first sample bottle 2 is higher than the height of the first liquid outlet pipe 11 at one end inside the first sample bottle 2. The second air inlet pipe 17 and the second liquid outlet pipe 18 are both inserted into the second sample bottle 5, and the height of the second air inlet pipe 17 at one end inside the second sample bottle 5 is higher than the height of the second liquid outlet pipe 18 at one end inside the second sample bottle 5. This allows the inert gas delivered into the sample bottle through the air inlet pipe to apply pressure to the liquid surface of the liquid sample, allowing the liquid sample at the bottom to be smoothly discharged through the liquid outlet pipe under the action of pressure. The first delivery pipe 15, the second delivery pipe 22, and the discharge pipe 24 are all connected to the receiving bottle 8, and the ends inserted into the receiving bottle 8 are close to the top of the receiving bottle 8, so as to maximize the displacement of air in the receiving bottle 8 and discharge the air. In this embodiment, the ends of first air inlet pipe 10, first liquid outlet pipe 11, second air inlet pipe 17, second liquid outlet pipe 18, first delivery pipe 15, second delivery pipe 22, and discharge pipe 24 all utilize puncture needles to facilitate smooth insertion into the bottle. Before dispensing the liquid sample, the weight m0 of receiving bottle 8 can be measured. After the liquid sample in first sample bottle 2 is transferred to receiving bottle 8, the new weight m1 of receiving bottle 8 can be measured. m1 - m0 represents the weight of the liquid sample transferred from first sample bottle 2 to receiving bottle 8 at that moment. After the liquid sample in second sample bottle 5 is transferred to receiving bottle 8, the new weight m2 of receiving bottle 8 can be measured. m2 - m1 represents the weight of the liquid sample transferred from second sample bottle 5 to receiving bottle 8 at that moment. Depending on the actual application, the three-way reversing valve can also be replaced by two ordinary valves. For example, the first three-way reversing valve 3 is removed, and a fourth valve and a fifth valve are added. The fourth valve is installed on the first air inlet pipe 10, and the fifth valve is installed on the first discharge pipe 14. The fifth valve is located between the first liquid outlet pipe 11 and the first branch pipe 12. When the fourth valve is opened and the fifth valve is closed at the same time, the first branch pipe 12 is connected to the first air inlet pipe 10, and the inert gas is transported to the first sample bottle 2. After applying pressure to the liquid sample inside, the liquid sample is transported to the first discharge pipe 14 through the first liquid outlet pipe 11; when the fifth valve is opened and the fourth valve is closed at the same time, the first branch pipe 12 is connected to the first discharge pipe 14, and the inert gas is transported to the first delivery pipe 15 or the first waste liquid pipe 16.

[0037] Optionally, the liquid sample preparation device under inert gas protection further includes an oxygen detector 25, which is provided on the discharge pipe 24. The oxygen detector 25 detects the oxygen content in the gas discharged from the discharge pipe 24 and in the receiving bottle 8. When the oxygen content drops to a preset value, it indicates that the air in the receiving bottle 8 has been completely replaced by the inert gas and subsequent operations can be performed.

[0038] The oxygen detector 25 can be any commercially available model that meets the oxygen content detection requirements, so as to facilitate observation by the operator.

[0039] Optionally, a first mass flow meter 26 is provided on the first discharge pipe 14. The first mass flow meter 26 can monitor the weight of the liquid sample discharged from the first sample bottle 2 in real time, thereby obtaining the weight of the liquid sample in the first sample bottle 2 received in the receiving bottle 8. This avoids inaccurate weight results caused by human experience and eliminates the tedious process of repeatedly weighing the receiving bottle 8.

[0040] like Figure 1 As shown, in this embodiment, the first mass flowmeter 26 is installed on the first discharge pipe 14 and is located between the first liquid outlet pipe 11 and the second three-way reversing valve 4. Depending on the actual application, the first mass flowmeter 26 can be any commercially available specification that meets the requirements for measuring the weight of the liquid sample.

[0041] Optionally, a second mass flow meter 27 is provided on the second discharge pipe 21. The second mass flow meter 27 can monitor the weight of the liquid sample discharged from the second sample bottle 5 in real time, thereby obtaining the weight of the liquid sample in the second sample bottle 5 received in the receiving bottle 8. This avoids inaccurate weight results caused by human experience and eliminates the tedious process of repeatedly weighing the receiving bottle 8.

[0042] like Figure 1 As shown, in this embodiment, the second mass flowmeter 27 is installed on the second discharge pipe 21 and is located between the second liquid outlet pipe 18 and the fourth three-way reversing valve 7. Depending on the actual application, the second mass flowmeter 27 can be any commercially available specification that meets the requirements for measuring the weight of the liquid sample.

[0043] Optionally, the liquid sample preparation device under inert gas protection also includes a controller (not shown), the input end of the controller is communicatively connected to the output end of the oxygen detector 25, the first mass flowmeter 26 and the second mass flowmeter 27, and the output end of the controller is communicatively connected to the control end of the second valve 13, the third valve 20, the first three-way reversing valve 3 and the third three-way reversing valve 6. In this configuration, the oxygen detector 25 transmits the measured oxygen content data to the controller in real time, the first mass flowmeter 26 transmits the measured first weight data of the liquid sample output from the first sample bottle 2 to the controller in real time, and the second mass flowmeter 27 transmits the measured second weight data of the liquid sample output from the second sample bottle 5 to the controller in real time. The controller receives the oxygen content data, the first weight data, and the second weight data. When the oxygen content data is less than the internally stored preset value, the first weight data is greater than the first preset weight, or the second weight data is greater than the second preset weight, the controller automatically controls the opening and closing of the second valve 13 and the third valve 20, and automatically controls the switching connection between the inlet of the first three-way reversing valve 3 and its first outlet or second outlet, and the switching connection between the inlet of the third three-way reversing valve 6 and its first outlet or second outlet. In this way, the operator is saved from manual operation of each valve.

[0044] The controller automatically controls the opening and closing of each valve and the communication mode of the three-way reversing valve based on the received oxygen content data, the first weight data, and the second weight data. This control logic can be implemented using existing mature algorithms, and the specific operating principles will not be described in detail. The controller can also be communicatively connected to the control terminals of the first valve 9, the second three-way reversing valve 4, and the fourth three-way reversing valve 7 to control the opening, closing, and communication mode of each valve.

[0045] Optionally, the liquid sample preparation device under inert gas protection further includes a waste liquid bottle 28, which is connected to the first waste liquid pipe 16 and the second waste liquid pipe 23. The waste liquid bottle 28 is provided so that when the inert gas or liquid sample is discharged through the first waste liquid pipe 16 and the second waste liquid pipe 23, it is not discharged directly into the external environment, but is instead discharged into the waste liquid bottle 28 for collection, thereby preventing environmental pollution.

[0046] like Figure 1 As shown, the ends of the first waste liquid pipe 16 and the second waste liquid pipe 23 away from the gas pipe 1 are respectively inserted into the waste liquid bottle 28.

[0047] Optionally, the first valve 9 is configured as a pressure regulating valve. With the help of the pressure regulating valve, no matter how the system pressure changes, the set flow rate can be kept unchanged, so as to control the system pressure.

[0048] Optionally, the liquid sample preparation device under inert gas protection further includes a gas storage tank (not shown), which is connected to the gas pipeline 1. The gas storage tank can be used to deliver a continuous and stable gas source to the gas pipeline 1. In this embodiment, the gas storage tank stores high-pressure inert gas.

[0049] Optionally, a first pressure sensor (not shown) is provided on the first branch pipe 12. The first pressure sensor can monitor the pressure of the gas flowing through the first branch pipe 12 in real time to prevent excessive fluctuations in the gas pressure, which could adversely affect the inert gas replacement of air in the pipe and the transport of the liquid sample in the first sample bottle 2 by means of the inert gas.

[0050] According to actual application conditions, the first pressure sensor can be a commercially available pressure sensor of any specification and model that can monitor the pressure of the flowing gas. The first pressure sensor has a digital display function, which is convenient for operators to observe intuitively.

[0051] Optionally, a second pressure sensor is provided on the second branch pipe 19. The second pressure sensor can monitor the pressure of the gas flowing through the second branch pipe 19 in real time to prevent excessive fluctuations in the gas pressure, which could adversely affect the inert gas replacement of air in the pipe and the transport of the liquid sample in the second sample bottle 5 by means of the inert gas.

[0052] According to the actual application, the second pressure sensor can be any commercially available pressure sensor of any specification and model that can monitor the pressure of the flowing gas. The second pressure sensor has a digital display function, which is convenient for the operator to observe intuitively.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A liquid sample preparation device under inert gas protection, characterized in that: include: a gas pipeline, wherein a first valve is installed on the gas pipeline; a first sample bottle, wherein the first sample bottle is connected to a first air inlet pipe and a first liquid outlet pipe, and the first air inlet pipe is higher than the first liquid outlet pipe; a first three-way reversing valve, wherein the inlet of the first three-way reversing valve is connected to the gas delivery pipe via a first branch pipe, and a second valve is installed on the first branch pipe, a first outlet of the first three-way reversing valve is connected to the first gas inlet pipe, a second outlet of the first three-way reversing valve is connected to a first discharge pipe, and the first discharge pipe is connected to the first liquid outlet pipe; a second three-way reversing valve, wherein the inlet of the second three-way reversing valve is connected to the first discharge pipe, the first outlet of the second three-way reversing valve is connected to the first delivery pipe, and the second outlet of the second three-way reversing valve is connected to the first waste liquid pipe; a second sample bottle, wherein the second sample bottle is connected to a second air inlet pipe and a second liquid outlet pipe, and the second air inlet pipe is higher than the second liquid outlet pipe; a third three-way reversing valve, wherein the inlet of the third three-way reversing valve is connected to the gas delivery pipe via a second branch pipe, and a third valve is installed on the second branch pipe, the first outlet of the third three-way reversing valve is connected to the second gas inlet pipe, the second outlet of the third three-way reversing valve is connected to the second discharge pipe, and the second discharge pipe is connected to the second liquid outlet pipe; a fourth three-way reversing valve, wherein the inlet of the fourth three-way reversing valve is connected to the second discharge pipe, the first outlet of the fourth three-way reversing valve is connected to the second delivery pipe, and the second outlet of the fourth three-way reversing valve is connected to the second waste liquid pipe; A receiving bottle is connected to the first delivery pipe and the second delivery pipe, and the receiving bottle is connected to the discharge pipe.

2. The liquid sample preparation device under inert gas protection according to claim 1, characterized in that: Also includes: An oxygen detector is provided on the discharge pipe.

3. The liquid sample preparation device under inert gas protection according to claim 2, characterized in that: The first discharge pipe is provided with a first mass flow meter.

4. The liquid sample preparation device under inert gas protection according to claim 3, characterized in that: The second discharge pipe is provided with a second mass flow meter.

5. The liquid sample preparation device under inert gas protection according to claim 4, characterized in that: Also includes: A controller, wherein the input end of the controller is communicatively connected to the output ends of the oxygen detector, the first mass flow meter, and the second mass flow meter, and the output end of the controller is communicatively connected to the control ends of the second valve, the third valve, the first three-way reversing valve, and the third three-way reversing valve.

6. The liquid sample preparation device under inert gas protection according to any one of claims 1 to 5, characterized in that: Also includes: A waste liquid bottle is connected to the first waste liquid pipe and the second waste liquid pipe.

7. The liquid sample preparation device under inert gas protection according to any one of claims 1 to 5, characterized in that: The first valve is configured as a pressure regulating valve.

8. The liquid sample preparation device under inert gas protection according to any one of claims 1 to 5, characterized in that: Also includes: A gas storage tank is connected to the gas pipeline.

9. The liquid sample preparation device under inert gas protection according to any one of claims 1 to 5, characterized in that: The first branch pipe is provided with a first pressure sensor.

10. The liquid sample preparation device under inert gas protection according to any one of claims 1 to 5, characterized in that: The second branch pipe is provided with a second pressure sensor.

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