Liquid sampling device, sampling method and use

Abstract

This invention relates to a liquid sampling device, sampling method, and application. The liquid sampling device includes an inner door opening / closing module and a sampling motion module located within a sealed enclosure. The inner door opening / closing module includes an inner chamber, an inner door, and a lifting support. The inner chamber is fixedly installed at the bottom of the sealed enclosure, and the opening of the inner chamber corresponds to the position of the inner door. The lifting support includes a base and a lifting column connected to each other. The base is fixed within the sealed enclosure, and the lifting column is inserted and connected to the inner door. In this liquid sampling device, the inner door can be raised parallel to the opening of the inner chamber, and the sampling motion module rises simultaneously, creating an open distance between the inner door and the opening of the inner chamber, facilitating the retrieval and hanging of the sampling container in a relatively open space.

Description

Technical Field

[0001] This invention relates to a liquid sampling device, sampling method, and application. Background Technology

[0002] As a fourth-generation nuclear reactor, the molten salt reactor uses molten salt as a coolant, so the composition of the molten salt within the reactor directly affects the safe and stable operation of the experimental reactor. However, the molten salt in the experimental reactor has characteristics such as high temperature, strong corrosiveness, and high radioactivity, which brings difficulties to sampling. In addition, when sampling inside the reactor, it is necessary to avoid introducing impurities into the reactor during the sampling process, and at the same time, the extracted samples must not be contaminated.

[0003] Currently, there are two types of sampling devices for high-temperature radioactivity within reactors. One is the capsule sampling device used in molten salt reactors by Oak Ridge National Laboratory (ORNL) in the United States, and the other is a sampling device for radioactive liquid metals developed by CGN (patent number CN 211627032U). This sampling device is used for sampling high-temperature liquid metals. ORNL's capsule sampling device is located far from the experimental reactor. The sampling device is connected to the reactor via a slanted sampling pipe and is isolated by a valve. During sampling, a robotic arm hangs the capsule onto the sampling device, then the valve is opened, and a steel cable is lowered into the reactor by the rotation of a motor inside the sampling device. After sampling, the motor inside the sampling device rotates in the reverse direction to retract the steel cable and lift the capsule back into the sampling device. Then, the robotic arm removes the capsule, completing the sampling process. In CGN's sampling device, the sampling mechanism is directly located above the reactor core. A moving mechanism delivers the lead shielding container and sampling components below the sampling mechanism, which is then remotely operated to complete the sampling. The retrieved samples are then transported back to the sampling room or a safe area via a transport mechanism. As can be seen from the above, for high-temperature radioactive sampling, the personnel operating area must be far from the sampling point. In ORNL's device, the sampling device is located far from the sampling point, connected to it via pipelines. In CGN's device, the sampling mechanism is above the sampling point, and the collected samples are transported to a distant sampling room via rails and a transport mechanism. CGN's sampling mechanism is placed near the sampling point. If a malfunction occurs and maintenance is required, the high-temperature and high-radioactivity environment near the sampling point makes it difficult for personnel to reach and maintain the equipment. Furthermore, in molten salt reactors, the internal space is limited, and there is a large amount of equipment requiring multiple steps, leaving insufficient space for installing the sampling mechanism in close proximity. Therefore, sampling within the molten salt pile will adopt the ORNL device model, where the sampling mechanism is placed far from the sampling point, and the capsule is transported to the sampling point through an inclined sampling pipe to complete the sampling.

[0004] Directly using ORNL's device for molten salt sampling in the reactor still has the following problems: First, there is the problem of capsule positioning. During sampling, the capsule can be immersed below the surface of the molten salt while the wire rope cannot contact the molten salt. Considering the fluctuation of the molten salt surface when the molten salt pump in the reactor is running, a section of flexible chain that can be immersed in the molten salt will be connected between the wire rope and the capsule. However, due to space constraints, the chain length is generally no more than 10cm, while the sampling location is far from the sampling device (more than 10m). Coupled with the "black box" environment inside the reactor, ensuring that the capsule can accurately descend to the appropriate position after multiple (more than 500) uses is undoubtedly a challenge. Secondly, there is the issue of operational convenience. Due to the high radioactivity of the molten salt inside the reactor, the sampling device needs to be placed in a hot chamber. ORNL uses a semi-sealed side-opening inner chamber structure, and the inner chamber door is small, making it inconvenient for the robotic arm to operate. In addition, there is the problem that capsules that fall into the inner chamber are difficult to find. Thirdly, there is the problem of wire rope entanglement. In ORNL, there have been multiple instances of capsules getting stuck in the pipes, while the motor continued to lower the wire rope, causing the wire rope to become entangled. Fourthly, there is the issue of maintenance. The sampling device is placed in a hot chamber, which is inaccessible to personnel, making it difficult to maintain the equipment in case of failure. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome at least one of the defects in the prior art, such as difficulty in positioning, difficulty in operation, wire rope entanglement and difficulty in maintenance, and to provide a liquid sampling device, sampling method and application.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] In a first aspect, the present invention provides a liquid sampling device, which includes an inner door opening and closing module and a sampling motion module located in a sealed box; the inner door opening and closing module includes an inner chamber, an inner door and a lifting bracket;

[0008] The inner compartment is fixedly installed at the bottom of the sealed box, and the opening of the inner compartment corresponds to the position of the inner door;

[0009] The lifting support includes a base and a lifting column connected to each other. The base is fixed inside the sealed box, and the lifting column is inserted and connected to the inner cabin door.

[0010] The sampling motion module is fixed on the side of the inner door away from the inner compartment. The sampling motion module includes a liftable sampling head, which can hang a sampling container.

[0011] The side of the inner compartment away from the inner compartment door is connected to a sampling channel via an isolation valve. The sampling channel is located outside the sealed box and is connected to the liquid container to be sampled.

[0012] In this invention, the sealed enclosure can control the water and oxygen content, ensuring that the extracted liquid is not contaminated.

[0013] In this invention, the liquid container is typically located several meters underground.

[0014] In this invention, the sampling channel can be tilted, vertical, or curved.

[0015] In this invention, the liquid sampling device can be placed 10-15m above the liquid container, for example, at 0m above the ground.

[0016] In this invention, the inner cabin door opening and closing module may further include a lifting motor for driving the inner cabin door to move up and down along the lifting bracket.

[0017] In this invention, the lifting column can be four lead screws, which are respectively connected to the four corners of the inner cabin door.

[0018] In this invention, the lifting column may be equipped with a limit switch to prevent the inner cabin door from closing too tightly or exceeding its range during the lowering and raising processes.

[0019] In this invention, the sampling motion module may further include a spool wound with thread, the thread being connected to the sampling head. The thread may be made of a corrosion-resistant material, such as stainless steel, nickel-based alloy, nickel, gold, silver, or platinum. The sampling head may also be made of a corrosion-resistant material, such as stainless steel, nickel-based alloy, nickel, gold, silver, or platinum. The sampling motion module may further include a weight sensor, a pedometer, or a motor for driving the spool.

[0020] The sampling motion module also includes a winding organizer. This ensures that the yarn is neatly stacked in the spool, guaranteeing the repeatability of the sampling container when it is lowered to the designated position multiple times. Furthermore, by testing the relationship between motor rotation and the lowering distance of the sampling container, the sampling positioning problem is solved.

[0021] In this invention, the liquid sampling device further includes a control module, which is signal-connected to the sampling motion module. The control module reads the readings of the weight sensor in the sampler motion module. When the sampling container gets stuck in the sampling channel, the weight sensor detects the change in force on the wire and sends a command to the motor to stop lowering the wire, thus preventing tangling caused by excessive wire lowering.

[0022] In this invention, the sampling container may be capsule-shaped.

[0023] In this invention, the sampling head can be hook-shaped, mushroom-shaped, or a quick-connect connector.

[0024] In this invention, the liquid container can be the main container of a radioactive molten salt reactor, filled with radioactive molten salt from the reactor's primary loop.

[0025] In this invention, the liquid container can be a molten salt reactor cooling salt storage tank, filled with reactor secondary loop cooling salt.

[0026] In this invention, the liquid sampling device may further include a sampling tank module. This module is used to open and seal the sampling tank containing the sampling container.

[0027] In this invention, the liquid sampling device may further include a gas replacement module, which includes an inlet pipe and an outlet pipe connected to the side wall of the inner chamber. An inlet valve is provided on the inlet pipe. An outlet valve is provided on the outlet pipe. A pressure sensor is provided on the outlet pipe. The outlet pipe is connected to a vacuum pump.

[0028] Secondly, the present invention provides a liquid sampling method, which employs the liquid sampling device described above, and includes the following steps:

[0029] S1. Keep the isolation valve closed and hang the sampling container on the sampling head;

[0030] S2. Lower the inner hatch to the opening of the inner compartment;

[0031] S3. Open the isolation valve and lower the sampling container into the liquid container for sampling;

[0032] S4. Raise the sampling container to a position higher than the isolation valve and close the isolation valve.

[0033] In this invention, the sampling device may further include a gas replacement module, which includes an inlet pipe and an outlet pipe connected to the side wall of the inner chamber. Step S1 specifically involves: keeping the isolation valve closed, lowering the inner chamber door to the opening of the inner chamber, evacuating the inner chamber to a vacuum, then introducing an inert gas into the inner chamber, raising the inner chamber door, and hanging the sampling container on the sampling hanger. The inert gas may be argon. The pressure of the inert gas introduced into the inner chamber is higher than the pressure of the sealed box.

[0034] In this invention, the sampling device may further include a sampling container module, and in step S1, the sampling container is obtained from the sampling container module.

[0035] In this invention, in step S1, the sampling container can be weighed before being hung on the sampling hanger.

[0036] In this invention, in step S2, before lowering the inner cabin door, a temporary baffle can be placed at the opening of the inner cabin to prevent the sampling container from falling into the inner cabin.

[0037] In this invention, the sampling device may further include a gas replacement module, which includes an inlet pipe and an outlet pipe connected to the side wall of the inner chamber. In step S3, before the isolation valve is opened, the inner chamber is evacuated to a vacuum, and then an inert gas is introduced into the inner chamber. The inert gas may be argon. The pressure of the inert gas introduced into the inner chamber is higher than the pressure of the liquid container.

[0038] In this invention, the sampling device may further include a gas replacement module, which includes an inlet pipe and an outlet pipe connected to the side wall of the inner chamber. In step S4, after the isolation valve is closed, the inner chamber is evacuated to a vacuum, and then an inert gas is introduced into the inner chamber. The inert gas may be argon. The pressure inside the inner chamber is higher than the pressure of the sealed enclosure when the inert gas is introduced into the inner chamber.

[0039] In this invention, in step S4, after the isolation valve is closed, the inner cabin door is raised, and the sampling container is raised to leave the inner cabin.

[0040] Thirdly, the present invention provides an application of the liquid sampling device as described above, which is used for sampling radioactive molten salt in the primary loop of a reactor or cooling salt in the secondary loop of a reactor.

[0041] When sampling radioactive molten salt in the reactor primary loop, the inner door opening and closing module and the sampling motion module are located in the hot chamber.

[0042] The positive and progressive effects of this invention are as follows:

[0043] (1) The sampling device of the present invention adopts a modular design. The vulnerable or difficult-to-replace parts of each module are designed to be easily disassembled and assembled by a robotic arm, which facilitates maintenance.

[0044] (2) In the sampling device of the present invention, the inner hatch can be raised parallel to the opening of the inner compartment, and the sampling motion module is raised together, so that there is an open distance between the inner hatch and the opening of the inner compartment, which makes it convenient to take up and hang the sampling container in a relatively open space.

[0045] (3) The sampling device of the present invention has a jamming warning function in the control module. When the sampling container jams, the motor will immediately stop releasing the wire, thus avoiding the problem of wire tangling.

[0046] (4) The sampling device of the present invention has a precise placement of the sampling container. As long as the relationship between the motor rotation and the descent distance of the sampling container is obtained through preliminary testing, the sampling device can ensure the descent accuracy in subsequent repeated use.

[0047] (5) The sampling device of the present invention can accurately lower the sampling container and avoid the problem of wire tangling. Therefore, it can be installed near the ground surface, which is convenient for maintenance and operation.

[0048] (6) In the sampling method of the present invention, a temporary baffle may be provided before the sampling container enters the inner chamber to prevent the sampling container from falling into the inner chamber. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the liquid sampling device in Example 1;

[0050] The following components are labeled in the diagram: 1. Sampling motion module; 2. Inner door; 3. Sampling container; 4. Sampling tank module; 5. Inner chamber; 6. Inlet valve; 7. Isolation valve; 8. Pressure sensor; 9. Outlet valve; 10. Vacuum pump; 11. Lifting motor; 12. Lifting bracket; 13. Sealed box; 14. Sampling channel; 15. Liquid container. Detailed Implementation

[0051] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0052] Example 1

[0053] A liquid sampling device, such as Figure 1 It includes an inner hatch opening and closing module and a sampling motion module 1 located inside the sealed enclosure 13; the inner hatch opening and closing module includes an inner compartment 5, an inner hatch 2 and a lifting bracket 12.

[0054] The sampling motion module 1, the inner door 2, and the lifting bracket 12 are located inside the sealed box 13; the inner compartment 5 is fixedly installed at the bottom of the sealed box 13, and the opening of the inner compartment 5 corresponds to the position of the inner door 2.

[0055] The lifting support 12 includes a base and a lifting column that are connected to each other. The base is fixed inside the sealed box 13, and the lifting column is inserted into the inner door 2.

[0056] The sampling motion module 1 is fixed on the side of the inner door 2 away from the inner compartment 5. The sampling motion module 1 includes a liftable sampling head, which can hang a sampling container 3.

[0057] The side of the inner compartment 5 away from the inner compartment door 2 is connected to the sampling channel 14 via the isolation valve 7. The sampling channel 14 is located outside the sealed box 13 and is connected to the liquid container 15 to be sampled.

[0058] In this embodiment, the sealed enclosure 13 is a closed space that can control the water and oxygen content, ensuring that the extracted liquid is not contaminated. The liquid container 15 is generally located several meters underground. The liquid sampling device is placed near the ground surface. The sampling channel 14 is set at an angle or vertically. In this embodiment, the inner door 2 is above the inner chamber 5. The inner door 2 is raised and lowered along the lifting bracket 12, thereby realizing the opening and closing of the inner door 2. At the same time, the sampling motion module 1 is installed on the inner door 2. When the inner door 2 is raised, the sampling motion module 1 is also raised. Even if the volume of the inner chamber 5 is small, the sampling container 3 on the sampling motion module 1 is directly exposed inside the sealed enclosure 13 as the inner door 2 is raised, which is convenient for the robot arm to operate and pick up.

[0059] In this embodiment, the inner hatch door opening and closing module also includes a lifting motor 11 for driving the inner hatch door 2 to move up and down along the lifting bracket 12. In this embodiment, the lifting column consists of four lead screws, which are respectively connected to the four corners of the inner hatch door 2. Limit switches are provided on the lifting column to prevent the inner hatch door 2 from being over-closed or exceeding the range during the descent and ascent processes.

[0060] In this embodiment, the sampling motion module 1 further includes a spool wound with thread, the thread being connected to the sampling head. Both the thread and the sampling head are made of stainless steel. The sampling motion module 1 also includes a motor for driving the spool. The sampling container 3 is capsule-shaped. The sampling head is mushroom-shaped. In this embodiment, the sampling motion module 1 also includes a thread arranger to ensure the thread is neatly stacked in the spool, guaranteeing repeatability when the sampling container 3 is lowered to the designated position multiple times. Furthermore, by testing the relationship between motor rotation and the lowering distance of the sampling container 3, the sampling positioning problem is solved.

[0061] In this embodiment, the sampling device further includes a control module, which is signal-connected to the sampling motion module 1. The control module is used to read the readings of the weight sensor in the sampler motion module 1. When the sampling container 3 gets stuck in the sampling channel 14, the weight sensor will sense the change in force on the wire and send a command to the motor to stop lowering the wire, thus avoiding tangling caused by excessive lowering of the wire.

[0062] In this embodiment, the sampling device further includes a gas replacement module, which includes an inlet pipe and an outlet pipe connected to the side wall of the inner chamber 5. An inlet valve 6 is provided on the inlet pipe. An outlet valve 9 is provided on the outlet pipe. A pressure sensor 8 is provided on the outlet pipe. The outlet pipe is connected to a vacuum pump 10.

[0063] Example 2

[0064] A method for sampling high-temperature molten salt inside a reactor uses the liquid sampling device described in Example 1 to sample the main container of a 2MWt liquid fuel thorium-based molten salt experimental reactor. At this time, the inner hatch opening / closing module and the sampling motion module are located in the hot chamber, the sampling channel 14 is inclined, and the liquid container 15 is the main container of the radioactive molten salt reactor. The specific operation is as follows:

[0065] S1. Keep the isolation valve 7 closed, with the inner door 2 covering the inner chamber 5 to seal the inner chamber 5. Close the inlet valve 6, open the outlet valve 9 and vacuum pump 10 to extract the gas from the inner chamber 5. Then close the outlet valve 9, open the inlet valve 6, and fill the inner chamber 5 with argon gas. According to the pressure sensor 8, the pressure in the inner chamber 5 is slightly higher than the pressure in the sealed box 13, thus completing the gas replacement. Then, the lifting motor 11 drives the screw of the lifting bracket 12 to rotate, raising the inner door 2 to a suitable position. The robotic arm is then used to remove the capsule-shaped sampling container 3 from the sampling tank module 4, weigh it, and hang it on the sampling hanger.

[0066] S2. Lower the inner hatch 2 to the opening of the inner compartment 5, thus closing the inner compartment 5;

[0067] S3. Close the inlet valve 6, open the outlet valve 9 and vacuum pump 10 to extract the gas from the inner chamber 5, then close the outlet valve 9 and open the inlet valve 6 to fill the inner chamber 5 with argon gas. According to the pressure sensor 8, the pressure in the inner chamber 5 is slightly higher than the pressure in the liquid container 15, and the gas replacement is completed. Then open the isolation valve 7 and lower the sampling container 3 to the liquid container 15 for sampling.

[0068] S4. Raise the sampling container 3 to a position higher than the isolation valve 7, and close the isolation valve 7; close the inlet valve 6, open the outlet valve 9 and vacuum pump 10 to extract the gas from the inner chamber 5, then close the outlet valve 9, open the inlet valve 6, and fill the inner chamber 5 with argon gas. According to the pressure sensor 8, the pressure in the inner chamber 5 is slightly higher than the pressure in the sealed box 13, completing the gas replacement; then, drive the lifting motor 11 to rotate the lead screw of the lifting bracket 12 to raise the inner door 2, and then raise the sampling container 3 to leave the inner chamber 5. Operate the robotic arm to remove the sampled sampling container 3, weigh it, put it into the sampling tank, and send it into the sampling tank module 4 to complete the entire sampling process.

[0069] In this embodiment, the above method was used to extract more than 30 high-temperature molten salt samples from the main reactor vessel to ensure that no gas or other impurities are introduced into the reactor during the sampling process, and that the extracted samples do not absorb moisture and oxygen from the air, thus ensuring the quality of the sampling.

[0070] Example 3

[0071] A method for sampling molten salt reactor cooling salt is provided, using the liquid sampling device described in Example 1. Sampling is performed on the molten salt reactor cooling salt storage tank of a 2MWt liquid fuel thorium-based molten salt experimental reactor. The sealed enclosure 13 is a glove box, the sampling channel 14 is vertically arranged, and the liquid container 15 is the molten salt reactor cooling salt storage tank. The specific operation is as follows:

[0072] S1. Keep the isolation valve 7 closed, with the inner door 2 covering the inner chamber 5 to seal the inner chamber 5. Close the inlet valve 6, open the outlet valve 9 and vacuum pump 10 to extract the gas from the inner chamber 5. Then close the outlet valve 9, open the inlet valve 6, and fill the inner chamber 5 with argon gas. According to the pressure sensor 8, the pressure in the inner chamber 5 is slightly higher than the pressure in the sealed box 13, thus completing the gas replacement. Then, make the lifting motor 11 drive the screw of the lifting bracket 12 to rotate, raise the inner door 2 to the appropriate position, and manually take out the capsule-shaped sampling container 3 from the sampling tank module 4. After weighing, hang it on the sampling hanger.

[0073] S2. Lower the inner hatch 2 to the opening of the inner compartment 5, thus closing the inner compartment 5;

[0074] S3. Close the inlet valve 6, open the outlet valve 9 and vacuum pump 10 to extract the gas from the inner chamber 5, then close the outlet valve 9 and open the inlet valve 6 to fill the inner chamber 5 with argon gas. According to the pressure sensor 8, the pressure in the inner chamber 5 is slightly higher than the pressure in the liquid container 15, and the gas replacement is completed. Then open the isolation valve 7 and lower the sampling container 3 to the liquid container 15 for sampling.

[0075] S4. Raise the sampling container 3 to a position higher than the isolation valve 7, and close the isolation valve 7; close the inlet valve 6, open the outlet valve 9 and vacuum pump 10 to extract the gas from the inner chamber 5, then close the outlet valve 9, open the inlet valve 6, and fill the inner chamber 5 with argon gas. According to the pressure sensor 8, the pressure in the inner chamber 5 is slightly higher than the pressure in the sealed box 13, completing the gas replacement; then, drive the lifting motor 11 to rotate the screw of the lifting bracket 12 to raise the inner door 2, and then raise the sampling container 3 to leave the inner chamber 5. Manually remove the sampling container 3 after sampling, weigh it, put it into the sampling tank, and send it into the sampling tank module 4 to complete the entire sampling process.

[0076] In this embodiment, the above method was used to take more than 10 high-temperature molten salt samples from the molten salt reactor cooling salt storage tank to ensure that no gas or other impurities are introduced into the reactor during the sampling process, and that the samples taken out do not absorb moisture and oxygen from the air, thus ensuring the quality of the sampling.

[0077] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A liquid sampling device, characterized in that, It includes an inner hatch opening and closing module and a sampling motion module located inside a sealed enclosure; the inner hatch opening and closing module includes an inner compartment, an inner hatch, and a lifting support. The inner compartment is fixedly installed at the bottom of the sealed box, and the opening of the inner compartment corresponds to the position of the inner door; The lifting support includes a base and a lifting column connected to each other. The base is fixed inside the sealed box, and the lifting column is inserted and connected to the inner cabin door. The sampling motion module is fixed on the side of the inner door away from the inner compartment. The sampling motion module includes a liftable sampling head, which can hang a sampling container. The side of the inner compartment away from the inner compartment door is connected to the sampling channel via an isolation valve. The sampling channel is located outside the sealed box and is connected to the liquid container to be sampled. The liquid container is the main container of a radioactive molten salt reactor; The liquid sampling motion module also includes a spool with a thread wound around it, and the thread is connected to the sampling head.

2. The liquid sampling device according to claim 1, characterized in that, The liquid container is located underground; The sampling channel may be inclined, vertical, or curved. The liquid sampling device is placed 10-15m above the liquid container.

3. The liquid sampling device according to claim 2, characterized in that, The liquid sampling device is placed at a height of 0 meters above the ground.

4. The liquid sampling device according to claim 1, characterized in that, The inner cabin door opening and closing module also includes a lifting motor for driving the inner cabin door to move up and down along the lifting bracket; The lifting column consists of four lead screws, which are respectively connected to the four corners of the inner cabin door; The lifting column is equipped with a limit switch; The sampling container is capsule-shaped; The sampling container is made of corrosion-resistant material; The sampling head is hook-shaped, mushroom-shaped, or a quick-connect connector. The liquid sampling device also includes a sampling tank module.

5. The liquid sampling device according to claim 4, characterized in that, The sampling container is made of stainless steel, nickel-based alloy, nickel, gold, silver, or platinum.

6. The liquid sampling device according to claim 1, characterized in that, The thread is made of a corrosion-resistant material; The sampling head is made of corrosion-resistant material; The sampling motion module also includes a weight sensor, a pedometer, or a motor for driving the reel; The sampling motion module also includes a winding tidyer.

7. The liquid sampling device according to claim 6, characterized in that, The wire is made of stainless steel, nickel-based alloy, nickel, gold, silver, or platinum.

8. The liquid sampling device according to claim 6, characterized in that, The sampling head is made of stainless steel, nickel-based alloy, nickel, gold, silver, or platinum.

9. The liquid sampling device according to claim 1, characterized in that, The liquid sampling device also includes a control module, which is signal-connected to the sampling motion module.

10. The liquid sampling device according to claim 1, characterized in that, The liquid sampling device also includes a gas replacement module, which includes an inlet pipe and an outlet pipe connected to the side wall of the inner compartment. An intake valve is provided on the intake pipe; An air outlet valve is provided on the air outlet pipe; A pressure sensor is installed on the air outlet pipe; The exhaust pipe is connected to the vacuum pump.

11. A liquid sampling method, characterized in that, It employs the liquid sampling device as described in any one of claims 1-10, and includes the following steps: S1. Keep the isolation valve closed and hang the sampling container on the sampling head; S2. Lower the inner hatch to the opening of the inner compartment; S3. Open the isolation valve and lower the sampling container into the liquid container for sampling; S4. Raise the sampling container to a position higher than the isolation valve and close the isolation valve.

12. The liquid sampling method according to claim 11, characterized in that, The liquid sampling device further includes a gas replacement module, which includes an inlet pipe and an outlet pipe connected to the side wall of the inner chamber. Step S1 specifically involves: keeping the isolation valve closed, lowering the inner chamber door to the opening of the inner chamber, evacuating the inner chamber to a vacuum, then introducing inert gas into the inner chamber, raising the inner chamber door, and hanging the sampling container on the sampling hanger; the inert gas is argon; the pressure of the inert gas introduced into the inner chamber is higher than the pressure of the sealed box. The liquid sampling device further includes a sampling tank module. In step S1, the sampling container is obtained from the sampling tank module. In step S1, the sampling container is weighed and then hung on the sampling hanger. In step S2, before lowering the inner cabin door, a temporary baffle is placed at the opening of the inner cabin.

13. The liquid sampling method according to claim 11, characterized in that, The liquid sampling device further includes a gas replacement module, which includes an inlet pipe and an outlet pipe connected to the side wall of the inner chamber. In step S3, before the isolation valve is opened, the inner chamber is evacuated to a vacuum, and then an inert gas is introduced into the inner chamber. The inert gas is argon. The inert gas is introduced into the inner chamber until the pressure inside the inner chamber is higher than the pressure of the liquid container. The liquid sampling device further includes a gas replacement module, which includes an inlet pipe and an outlet pipe connected to the side wall of the inner chamber. In step S4, after the isolation valve is closed, the inner chamber is evacuated to a vacuum, and then an inert gas is introduced into the inner chamber. The inert gas is argon. The pressure inside the inner chamber is higher than the pressure of the sealed box. In step S4, after the isolation valve is closed, the inner cabin door is raised, and the sampling container is raised to leave the inner cabin.

14. An application of a liquid sampling device as described in any one of claims 1-10, characterized in that, It is used for sampling radioactive molten salt in the primary loop of a reactor or cooling salt in the secondary loop of a reactor; When sampling radioactive molten salt in the reactor primary loop, the inner door opening and closing module and the sampling motion module are located in the hot chamber.

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