Molten salt sampling device

Abstract

The utility model provides a fused salt sampling device, and relates to the technical field of fused salt sampling. The device comprises a movable assembly and a sampling assembly, the movable assembly comprises a connecting rod and a plunger; one end of the connecting rod is connected with the plunger; the sampling assembly comprises a sampling box, a liquid inlet pipe and a liquid outlet pipe, a sampling cavity is formed in the sampling box, the plunger is arranged in the sampling cavity, and the connecting rod drives the plunger to move in the extending direction of the sampling cavity; the liquid inlet pipe and the liquid outlet pipe are both communicated with the sampling cavity and deviate from the connecting rod, the liquid outlet pipe is used for being communicated with a fused salt sampling container, and the liquid inlet pipe is used for being communicated with a fused salt storage container; the plunger is configured to move relative to the sampling cavity so as to adjust the pressure in the sampling cavity, so that one of the liquid inlet pipe and the liquid outlet pipe is opened, and the other one is closed. Molten salt sampling can be achieved by driving the plunger to move through the connecting rod, and sampling is convenient.

Description

Technical Field

[0001] The present application relates to the technical field of molten salt sampling, and in particular to a molten salt sampling device. Background Art

[0002] During the operation of a CSP plant, the molten salt operates at a high temperature. During the heat exchange process, some impurities will inevitably enter the molten salt, which will have a certain impact on the thermal melting and thermal conductivity of the molten salt, reducing the power generation efficiency of the CSP plant. Therefore, in order to monitor the impurities and contamination of the molten salt, it is necessary to regularly sample and test the molten salt.

[0003] In the prior art, two check valves cooperate with the liquid medium in the U-shaped fluid piston pump body driven by a motor to repeatedly rise and fall to drive the high-temperature molten salt from the molten salt tank into the high-temperature molten salt heating working pipeline to achieve molten salt sampling.

[0004] However, the above device has a complex structure, high sampling cost and inconvenient sampling. Utility Model Content

[0005] The present application provides a molten salt sampling device to solve the problems of the above-mentioned device having a relatively complex structure, high sampling cost and inconvenient sampling.

[0006] In order to achieve the above purpose, the technical solution of this application is as follows:

[0007] The present application provides a molten salt sampling device, comprising: a movable component and a sampling component;

[0008] The movable assembly includes a connecting rod and a plunger, one end of the connecting rod is connected to the plunger;

[0009] The sampling assembly includes a sampling box, a liquid inlet pipe and a liquid outlet pipe. The sampling box has a sampling cavity, a plunger is arranged in the sampling cavity, and a connecting rod drives the plunger to move along the extension direction of the sampling cavity; the liquid inlet pipe and the liquid outlet pipe are both connected to the sampling cavity and away from the connecting rod, the liquid outlet pipe is used to communicate with the sampling container of the molten salt, and the liquid inlet pipe is used to communicate with the storage container of the molten salt;

[0010] The plunger is configured to move relative to the sampling chamber to adjust the pressure in the sampling chamber so that one of the liquid inlet pipe and the liquid outlet pipe is opened and the other is closed.

[0011] In some possible implementations, the molten salt sampling device provided in the present application further includes a switch assembly, the switch assembly includes a first switch and a second switch, the first switch is arranged in the sampling chamber, and the first switch opens or closes the liquid inlet pipe according to the pressure in the sampling chamber;

[0012] The second switch is arranged on the liquid outlet pipe, and the second switch opens or closes the liquid outlet pipe according to the pressure in the sampling cavity.

[0013] In some possible implementations, in the molten salt sampling device provided by the present application, the first switch and the second switch are both one-way valves.

[0014] In some possible implementations, the molten salt sampling device provided in the present application further includes a salt discharge component, which is connected to the liquid inlet pipe and discharges the molten salt in the liquid inlet pipe.

[0015] In some possible implementations, the molten salt sampling device provided in the present application, the salt discharge assembly includes a bypass pipe and a manual valve, the first end of the bypass pipe is connected to the liquid inlet pipe, and the manual valve is arranged on the bypass pipe to open or close the connection between the bypass pipe and the outside world.

[0016] In some possible implementations, the molten salt sampling device provided by the present application, the salt discharge assembly also includes a filter, the filter is connected to the second end of the bypass pipe, and the manual valve is located between the liquid inlet pipe and the filter.

[0017] In some possible implementations, the molten salt sampling device provided by the present application, the movable component also includes a handle, the handle is arranged at an end of the connecting rod away from the plunger, and the handle is located outside the sampling cavity.

[0018] In some possible implementations, the molten salt sampling device provided in the present application has a sampling box having a relative mounting end and an inclined end, a connecting rod is inserted into the mounting end, the inclined end is inclined, and a liquid inlet pipe and a liquid outlet pipe are located at the inclined end;

[0019] The connection point between the liquid inlet pipe and the inclined end is located between the connection point between the liquid outlet pipe and the inclined end and the installation end.

[0020] In some possible implementations, the molten salt sampling device provided in the present application further includes a heating component, which is sleeved on the outer side wall of the sampling box and is used to heat the sampling cavity.

[0021] In some possible implementations, in the molten salt sampling device provided by the present application, the heating component is an electric heating jacket.

[0022] The molten salt sampling device provided by the present application is provided with a movable component and a sampling component; the movable component includes a connecting rod and a plunger, one end of the connecting rod is connected to the plunger, so that the connecting rod drives the plunger to move synchronously; the sampling component includes a sampling box, a liquid inlet pipe and a liquid outlet pipe, the sampling box has a sampling cavity, the plunger is arranged in the sampling cavity, and the connecting rod drives the plunger to move along the extension direction of the sampling cavity; the liquid inlet pipe and the liquid outlet pipe are both connected to the sampling cavity and away from the connecting rod, the liquid outlet pipe is used to communicate with the sampling container of the molten salt, and the liquid inlet pipe is used to communicate with the storage container of the molten salt. The connecting rod drives the plunger to move upward along the extension direction of the sampling cavity, so that the pressure in the sampling cavity is reduced, so that the molten salt flows into the sampling cavity from the storage container through the liquid inlet pipe; or the connecting rod drives the plunger to move downward along the extension direction of the sampling cavity, so that the pressure in the sampling cavity becomes larger, so that the molten salt flows into the sampling container from the sampling cavity through the liquid outlet pipe, and the operator only needs to operate the connecting rod to drive the plunger to move to realize the molten salt sampling, and the sampling is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0024] Figure 1 A schematic diagram of the structure of a molten salt sampling device provided in an embodiment of the present application.

[0025] Description of reference numerals:

[0026] 100-Activity components;

[0027] 110-connecting rod;

[0028] 120- plunger;

[0029] 130-handle;

[0030] 200-sampling assembly;

[0031] 210 - sampling box; 211 - sampling cavity;

[0032] 220-liquid inlet pipe;

[0033] 230-liquid outlet pipe;

[0034] 300-Salt discharge assembly;

[0035] 310-Bypass pipe;

[0036] 320-manual valve;

[0037] 330-filter;

[0038] 400- switch assembly;

[0039] 410-first switch;

[0040] 420-second switch;

[0041] 500 - Heating element.

[0042] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0043] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0044] It should be noted that in the description of the embodiments of the present application, terms such as "upper", "lower", "inside" and "outside" indicating orientation or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of description, and do not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present application.

[0045] In addition, it should be noted that the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0046] In this application, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] As mentioned in the background technology, impurities in the molten salt will have a certain impact on the hot melting and thermal conductivity of the molten salt, reducing the power generation efficiency of the solar thermal power station. Therefore, in order to monitor the impurities and pollution of the molten salt, it is necessary to regularly sample and test the molten salt. In the prior art, two check valves are used to cooperate with the liquid medium in the U-shaped fluid piston pump body driven by the motor to repeatedly rise and fall to drive the high-temperature molten salt from the molten salt tank into the high-temperature molten salt heating working pipeline to achieve molten salt sampling. However, the above-mentioned device structure is relatively complex, difficult to manufacture, high cost, time-consuming to disassemble and assemble, and inconvenient to sample.

[0048] In view of this, the present application provides a molten salt sampling device, including: a movable component and a sampling component; the movable component includes a connecting rod and a plunger, one end of the connecting rod is connected to the plunger; the sampling component includes a sampling box, a liquid inlet pipe and a liquid outlet pipe, the sampling box has a sampling cavity, the plunger is arranged in the sampling cavity, and the connecting rod drives the plunger to move along the extension direction of the sampling cavity; the liquid inlet pipe and the liquid outlet pipe are both connected to the sampling cavity and away from the connecting rod, the liquid outlet pipe is used to communicate with the sampling container of the molten salt, and the liquid inlet pipe is used to communicate with the storage container of the molten salt. The connecting rod drives the plunger to move upward along the extension direction of the sampling cavity, so that the pressure in the sampling cavity is reduced, so that the molten salt flows from the storage container into the sampling cavity through the liquid inlet pipe; or drives the plunger to move downward along the extension direction of the sampling cavity, so that the pressure in the sampling cavity becomes larger, so that the molten salt flows from the sampling cavity into the sampling container through the liquid outlet pipe. The operator only needs to operate the connecting rod to drive the plunger to move to realize molten salt sampling, and sampling is more convenient.

[0049] Combine the following Figure 1 The present application is described in detail with reference to the accompanying drawings and specific embodiments.

[0050] The present application provides a molten salt sampling device, comprising: a movable component 100 and a sampling component 200; the movable component 100 comprises a connecting rod 110 and a plunger 120, one end of the connecting rod 110 is connected to the plunger 120; the sampling component 200 comprises a sampling box 210, a liquid inlet pipe 220 and a liquid outlet pipe 230, the sampling box 210 has a sampling cavity 211, the plunger 120 is arranged in the sampling cavity 211, and the connecting rod 110 drives the plunger 120 to move along the sampling cavity 211. The sample chamber 211 moves in the extension direction; the liquid inlet pipe 220 and the liquid outlet pipe 230 are both connected to the sampling chamber 211 and away from the connecting rod 110, the liquid outlet pipe 230 is used to communicate with the sampling container of the molten salt, and the liquid inlet pipe 220 is used to communicate with the storage container of the molten salt; the plunger 120 is configured to move relative to the sampling chamber 211, thereby adjusting the pressure in the sampling chamber 211, so that one of the liquid inlet pipe 220 and the liquid outlet pipe 230 is opened and the other is closed.

[0051] In a specific implementation, one end of the connecting rod 110 is connected to the plunger 120, and the connecting rod 110 is used to drive the plunger 120 to move; the sampling box 210 has a sampling chamber 211, the plunger 120 is arranged in the sampling chamber 211, the connecting rod 110 is partially arranged in the sampling chamber 211, and partially arranged outside the sampling box 210, and the connecting rod 110 drives the plunger 120 to move along the extension direction of the sampling chamber 211; the liquid inlet pipe 220 and the liquid outlet pipe 230 are both connected to the sampling chamber 211 and away from the connecting rod 110, the liquid outlet pipe 230 is used to communicate with the sampling container of the molten salt, and the liquid inlet pipe 220 is used to communicate with the storage container of the molten salt. It should be noted that the storage container can be a molten salt tank or a salt discharge tank.

[0052] In some embodiments, the connecting rod 110 drives the plunger 120 to move upward along the extension direction of the sampling chamber 211, so that the pressure in the sampling chamber 211 is reduced. At this time, the liquid inlet pipe 220 is opened and the liquid outlet pipe 230 is closed, so that the molten salt flows from the storage container through the liquid inlet pipe 220 into the sampling chamber 211; or the connecting rod 110 drives the plunger 120 to move downward along the extension direction of the sampling chamber 211, so that the pressure in the sampling chamber 211 becomes larger. At this time, the liquid inlet pipe 220 is closed and the liquid outlet pipe 230 is opened, so that the molten salt flows from the sampling chamber 211 through the liquid outlet pipe 230 into the sampling container. The structure is simple, and the operator only needs to operate the connecting rod 110 to drive the plunger 120 to move to achieve molten salt sampling.

[0053] The molten salt sampling device provided in the embodiment of the present application is provided with a movable component 100 and a sampling component 200; the movable component 100 includes a connecting rod 110 and a plunger 120, one end of the connecting rod 110 is connected to the plunger 120, so that the operator operates the connecting rod 110 to drive the plunger 120 to move synchronously; the sampling component 200 includes a sampling box 210, a liquid inlet pipe 220 and a liquid outlet pipe 230, the sampling box 210 has a sampling cavity 211, the plunger 120 is arranged in the sampling cavity 211, the connecting rod 110 drives the plunger 120 to move along the extension direction of the sampling cavity 211; the liquid inlet pipe 220 and the liquid outlet pipe 230 are both connected to the sampling cavity 211 and away from the connecting rod 110, the liquid outlet pipe 230 is used to communicate with the sampling container of the molten salt, and the liquid inlet pipe 220 is used to communicate with the storage container of the molten salt.

[0054] The connecting rod 110 drives the plunger 120 to move upward along the extension direction of the sampling chamber 211, so that the pressure in the sampling chamber 211 is reduced, so that the molten salt flows from the storage container into the sampling chamber 211 through the liquid inlet pipe 220; or drives the plunger 120 to move downward along the extension direction of the sampling chamber 211, so that the pressure in the sampling chamber 211 becomes larger, so that the molten salt flows from the sampling chamber 211 into the sampling container through the liquid outlet pipe 230. The operator only needs to operate the connecting rod 110 to drive the plunger 120 to move to realize molten salt sampling, and sampling is more convenient.

[0055] In some embodiments, the molten salt sampling device provided in the present application also includes a switch assembly 400, the switch assembly 400 includes a first switch 410 and a second switch 420, the first switch 410 is arranged in the sampling chamber 211, and the first switch 410 opens or closes the liquid inlet pipe 220 according to the pressure in the sampling chamber 211; the second switch 420 is arranged on the liquid outlet pipe 230, and the second switch 420 opens or closes the liquid outlet pipe 230 according to the pressure in the sampling chamber 211.

[0056] In a specific implementation, in order to facilitate the control of opening or closing of the liquid inlet pipe 220 and the liquid outlet pipe 230, a switch assembly 400 is further provided, and the switch assembly 400 includes a first switch 410 and a second switch 420. The first switch 410 is arranged in the sampling chamber 211, and the first switch 410 opens or closes the liquid inlet pipe 220 according to the pressure in the sampling chamber 211; the second switch 420 is arranged on the liquid outlet pipe 230, and the second switch 420 opens or closes the liquid outlet pipe 230 according to the pressure in the sampling chamber 211. Exemplarily, when the pressure in the sampling chamber 211 increases, the first switch 410 is closed, so that the liquid inlet pipe 220 is closed, and the second switch 420 is opened, so that the liquid outlet pipe 230 is opened; when the pressure in the sampling chamber 211 decreases, the first switch 410 is opened, so that the liquid inlet pipe 220 is opened, and the second switch 420 is closed, so that the liquid outlet pipe 230 is closed.

[0057] In some embodiments, the specific structure of the first switch 410 and the second switch 420 can be selected according to actual conditions, and the present application does not impose any restrictions on this. For example, the first switch 410 includes a spring, a valve core and a valve port. One end of the spring is arranged on the inner wall of the sampling chamber 211, and the other end is connected to the valve core. The valve core is used to abut or disengage from the valve port. The spring and the valve core are arranged above the valve port. When the pressure in the sampling chamber 211 decreases, the spring is compressed to disengage the valve core and the valve port, so that the liquid inlet pipe 220 and the sampling chamber 211 are connected; when the pressure in the sampling chamber 211 increases, the spring is stretched to abut the valve core and the valve port, so that the liquid inlet pipe 220 and the sampling chamber 211 are disconnected. The second switch 420 is similar in structure to the first switch 410, except that the spring and the valve core are arranged below the valve port. When the pressure in the sampling chamber 211 decreases, the spring is stretched to make the valve core and the valve port abut against each other, so that the liquid outlet pipe 230 and the sampling chamber 211 are disconnected; when the pressure in the sampling chamber 211 increases, the spring is compressed to make the valve core and the valve port disengage from the abutment, so that the liquid outlet pipe 230 and the sampling chamber 211 are connected.

[0058] Among them, in the molten salt sampling device provided in the present application, the first switch 410 and the second switch 420 are both one-way valves.

[0059] In specific implementation, the working principle of the one-way valve is to rely on the change of pressure to make the fluid flow in one direction to prevent reverse flow. It should be noted that the first switch 410 and the second switch 420 are opened or closed in opposite states.

[0060] In some other embodiments, the molten salt sampling device provided in the present application further includes a salt discharge component 300 , which is connected to the liquid inlet pipe 220 and discharges the molten salt in the liquid inlet pipe 220 .

[0061] In specific implementation, in order to prevent part of the molten salt from remaining on the liquid inlet pipe 220, a salt discharge assembly 300 is further provided on the liquid inlet pipe 220. One end of the salt discharge assembly 300 is connected to the atmosphere, and the other end is connected to the liquid inlet pipe 220 to discharge the molten salt in the liquid inlet pipe 220.

[0062] In some embodiments, the molten salt sampling device provided in the present application, the salt discharge assembly 300 includes a bypass pipe 310 and a manual valve 320, the first end of the bypass pipe 310 is connected to the liquid inlet pipe 220, and the manual valve 320 is arranged on the bypass pipe 310 to open or close the connection between the bypass pipe 310 and the outside world.

[0063] In a specific implementation, the first end of the bypass pipe 310 is used to communicate with the liquid inlet pipe 220, and the manual valve 320 is connected to the bypass pipe 310, and the manual valve 320 is used to open or close the connection between the bypass pipe 310 and the outside.

[0064] In some embodiments, an opening is provided on the side wall of the liquid inlet tube 220 , and the opening is communicated with the first end of the bypass tube 310 , and the opening is located below the connection between the liquid inlet tube 220 and the sampling chamber 211 .

[0065] It should be noted that the liquid inlet pipe 220 and the sampling chamber 211 are connected and then disconnected, and some molten salt still remains in the liquid inlet pipe 220. The operator opens the manual valve 320, and the bypass pipe 310 is connected to the external atmosphere. The gas passes through the bypass pipe 310 in turn and enters the liquid inlet pipe 220, causing the molten salt to fall back into the storage container to empty the liquid inlet pipe 220, thereby preventing the molten salt from sticking to the liquid inlet pipe 220 and affecting the next sampling.

[0066] In some embodiments, the manual valve 320 is opened. Since the liquid inlet pipe 220 is connected to the atmosphere, air enters the sampling chamber 211 through the liquid inlet pipe 220 , which can also assist in discharging the residual molten salt in the sampling chamber 211 .

[0067] In addition, in the molten salt sampling device provided in the present application, the salt discharge assembly 300 further includes a filter 330 , the filter 330 is connected to the second end of the bypass pipe 310 , and the manual valve 320 is located between the liquid inlet pipe 220 and the filter 330 .

[0068] In a specific implementation, in order to prevent impurities from entering the liquid inlet pipe 220, the filter 330 is connected to the second end of the bypass pipe 310. It should be noted that the second end of the bypass pipe 310 is connected to the atmosphere. The filter 330 is located above the manual valve 320 to filter out impurities such as dust and moisture in the air.

[0069] The present application does not limit the specific structure of the filter 330. Exemplarily, the filter 330 has multiple layers of filter mesh.

[0070] In some embodiments, in the molten salt sampling device provided in the present application, the movable component 100 further includes a handle 130 . The handle 130 is disposed at an end of the connecting rod 110 away from the plunger 120 , and the handle 130 is located outside the sampling cavity 211 .

[0071] In specific implementation, in order to facilitate the operator to apply force, a handle 130 is also provided at one end of the connecting rod 110. The handle 130 is connected to the connecting rod 110 and is arranged at the end away from the plunger 120. The handle 130 is arranged on the outside of the sampling box 210, and a part of the connecting rod 110 is arranged in the sampling cavity 211, and the other part is arranged in the sampling cavity 211.

[0072] In some embodiments, the molten salt sampling device provided in the present application, the sampling box 210 has a relative mounting end and an inclined end, the connecting rod 110 is inserted on the mounting end, the inclined end is inclined, and the liquid inlet pipe 220 and the liquid outlet pipe 230 are located at the inclined end; the connection between the liquid inlet pipe 220 and the inclined end is located between the connection between the liquid outlet pipe 230 and the inclined end and the mounting end.

[0073] In a specific implementation, the inclined end is inclined, the liquid inlet pipe 220 and the liquid outlet pipe 230 are located at the inclined end, and the connection between the liquid inlet pipe 220 and the inclined end is located between the connection between the liquid outlet pipe 230 and the inclined end and the installation end, so that the connection between the liquid inlet pipe 220 and the inclined end is higher than the connection between the liquid outlet pipe 230 and the inclined end, so that when the molten salt is discharged, the molten salt in the sampling chamber 211 flows into the liquid outlet pipe 230 as much as possible.

[0074] In some embodiments, the molten salt sampling device provided in the present application further includes a heating component 500 , which is sleeved on the outer wall of the sampling box 210 , and the heating component 500 is used to heat the sampling cavity 211 .

[0075] In specific implementation, in order to prevent the temperature of the sampling chamber 211 from being too low, the molten salt adheres to the inner wall of the sampling chamber 211. The molten salt sampling device also includes a heating component 500. The heating temperature of the heating component 500 is at least above the melting point of the molten salt. The heating component 500 is mounted on the outer wall of the sampling box 210.

[0076] In some embodiments, in the molten salt sampling device provided by the present application, the heating component 500 is an electric heating jacket.

[0077] In a specific implementation, the heating assembly 500 can be an electric heating sleeve, which is matched with the outer wall of the sampling box 210. The electric heating sleeve is set on the outer wall of the sampling box 210 to prevent the molten salt from rapidly solidifying and agglomerating at room temperature and adhering to the inner wall of the sampling cavity 211. Before sampling, the electric heating sleeve is first turned on, and the temperature of the sampling cavity 211 reaches above the melting point of the molten salt, so that the molten salt can flow in the sampling cavity 211 without solidifying and agglomerating, which is convenient for sampling.

[0078] In some embodiments, the present application does not limit the shape of the electric heating jacket. Exemplarily, the electric heating jacket is arc-shaped.

[0079] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the utility model disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0080] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A molten salt sampling device, characterized in that: include: A moving component (100) and a sampling component (200); The movable assembly (100) comprises a connecting rod (110) and a plunger (120), wherein one end of the connecting rod (110) is connected to the plunger (120); The sampling assembly (200) comprises a sampling box (210), a liquid inlet pipe (220) and a liquid outlet pipe (230); the sampling box (210) has a sampling cavity (211); the plunger (120) is arranged in the sampling cavity (211); the connecting rod (110) drives the plunger (120) to move along the extension direction of the sampling cavity (211); the liquid inlet pipe (220) and the liquid outlet pipe (230) are both connected to the sampling cavity (211) and away from the connecting rod (110); the liquid outlet pipe (230) is used to be connected to a sampling container of molten salt, and the liquid inlet pipe (220) is used to be connected to a storage container of molten salt; The plunger (120) is configured to move relative to the sampling chamber (211) to adjust the pressure in the sampling chamber (211) so that one of the liquid inlet pipe (220) and the liquid outlet pipe (230) is opened and the other is closed.

2. The molten salt sampling device according to claim 1, characterized in that: The device further comprises a switch assembly (400), wherein the switch assembly (400) comprises a first switch (410) and a second switch (420), wherein the first switch (410) is disposed in the sampling cavity (211), and the first switch (410) opens or closes the liquid inlet tube (220) according to the pressure in the sampling cavity (211); The second switch (420) is disposed on the liquid outlet pipe (230), and the second switch (420) opens or closes the liquid outlet pipe (230) according to the pressure in the sampling cavity (211).

3. The molten salt sampling device according to claim 2, characterized in that: The first switch (410) and the second switch (420) are both one-way valves.

4. The molten salt sampling device according to claim 1, characterized in that: It also includes a salt discharge component (300), which is in communication with the liquid inlet pipe (220) and discharges the molten salt in the liquid inlet pipe (220).

5. The molten salt sampling device according to claim 4, characterized in that: The salt discharge assembly (300) comprises a bypass pipe (310) and a manual valve (320), wherein a first end of the bypass pipe (310) is connected to the liquid inlet pipe (220), and the manual valve (320) is arranged on the bypass pipe (310) to open or close the connection between the bypass pipe (310) and the outside.

6. The molten salt sampling device according to claim 5, characterized in that: The salt discharge assembly (300) further comprises a filter (330), wherein the filter (330) is in communication with the second end of the bypass pipe (310), and the manual valve (320) is located between the liquid inlet pipe (220) and the filter (330).

7. The molten salt sampling device according to any one of claims 1 to 6, characterized in that: The movable assembly (100) further comprises a handle (130), wherein the handle (130) is arranged at an end of the connecting rod (110) away from the plunger (120), and the handle (130) is located outside the sampling cavity (211).

8. The molten salt sampling device according to claim 7, characterized in that: The sampling box (210) has an opposite mounting end and an inclined end, the connecting rod (110) is inserted into the mounting end, the inclined end is inclined, and the liquid inlet pipe (220) and the liquid outlet pipe (230) are located at the inclined end; The connection point between the liquid inlet pipe (220) and the inclined end is located between the connection point between the liquid outlet pipe (230) and the inclined end and the installation end.

9. The molten salt sampling device according to claim 8, characterized in that: It also comprises a heating component (500), wherein the heating component (500) is sleeved on the outer wall of the sampling box (210), and the heating component (500) is used to heat the sampling cavity (211).

10. The molten salt sampling device according to claim 9, characterized in that: The heating component (500) is an electric heating jacket.

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