Checking device and method

Abstract

The embodiment of the present application provides a verification device and method for verifying a mutual inductance type liquid metal liquid level meter, which comprises a liquid metal container, a heating component is arranged in the liquid metal container; a verification container, a mutual inductance type liquid metal liquid level meter to be verified and a verification probe assembly are arranged in the verification container, and the mutual inductance type liquid metal liquid level meter to be verified is verified by using a calibration value of the verification probe assembly; a first pipeline is arranged between the liquid metal container and the verification container, is connected with a liquid metal inlet and outlet of the liquid metal container and a first liquid metal inlet of the verification container respectively, and is used for bidirectional transportation of the liquid metal between the liquid metal container and the verification container, so as to adjust a liquid level position of the liquid metal in the verification container; and a liquid metal driving device is connected with the first pipeline and a second liquid metal outlet of the verification container, and is used for stirring the liquid metal in the verification container, so that the liquid metal in the verification container maintains a uniform temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid level measurement, and particularly relates to a calibration device for calibrating a mutual inductance liquid metal level gauge. BACKGROUND

[0002] The liquid level gauge is used for measuring the liquid metal level, and needs to be calibrated before leaving the factory or after being used for a period of time, so as to determine the measurement performance of the liquid level gauge under test. However, during the test, the liquid metal at different liquid level heights will appear thermal stratification phenomenon with the change of temperature gradient, the liquid level of the liquid metal changes, and then affects the calibration result of the liquid level gauge, resulting in low calibration accuracy. SUMMARY

[0003] In view of the above problems, the present application is proposed to provide a calibration device and method which can overcome the above problems or at least partially solve the above problems.

[0004] According to a first aspect of the embodiments of the present application, a calibration device is provided for calibrating a mutual inductance liquid metal level gauge, which comprises: a liquid metal container, wherein a heating component is arranged inside the liquid metal container, and is used for heating the liquid metal in the liquid metal container to a working temperature required for calibration; a calibration container for placing the mutual inductance liquid metal level gauge to be calibrated; a calibration probe assembly is arranged in the calibration container, and is used for calibrating the mutual inductance liquid metal level gauge to be calibrated by using the calibration value of the calibration probe assembly; a first pipeline is arranged between the liquid metal container and the calibration container, and is connected with the liquid metal inlet and outlet of the liquid metal container and the first liquid metal inlet of the calibration container, respectively, and is used for bidirectional transportation of the liquid metal between the liquid metal container and the calibration container; and a liquid metal driving device is connected with the first pipeline and the second liquid metal outlet of the calibration container, and is used for stirring the liquid metal in the calibration container, so that the liquid metal in the calibration container maintains a uniform temperature.

[0005] According to a second aspect of the embodiments of the present application, a verification method is provided, comprising: delivering liquid metal in a verification container to a liquid metal container through a first pipeline; heating the liquid metal in the liquid metal container to a working temperature required for verification by using a heating component; delivering the heated liquid metal to the verification container through the first pipeline; starting a liquid metal driving device to agitate the liquid metal in the verification container so as to keep the temperature of the liquid metal in the verification container constant; driving the verification probe assembly until the verification probe assembly reaches a preset detection position of the liquid metal in the verification container and generates an induction signal to obtain a calibration value of the verification probe assembly; and verifying the liquid level meter to be verified by using the calibration value of the verification probe assembly to obtain a liquid level indication of the liquid level meter to be verified at the preset detection position.

[0006] The verification device for verifying the mutual inductance type liquid metal liquid level meter provided by the embodiments of the present application can verify the liquid level meter to be verified by using the calibration value of the verification probe assembly, so that the verification result is more accurate and intuitive. In the verification process, the liquid metal driving device is used to agitate the liquid metal in the verification container, which effectively reduces the thermal stratification phenomenon caused by the liquid metal at different liquid level heights due to the gradient change of temperature, and improves the verification precision. The verification method provided by the present application can be applied to the verification device provided by the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 FIG. 1 is a schematic diagram of a verification device according to an embodiment of the present application;

[0008] Figure 2 FIG. 2 is a schematic diagram of a verification device according to another embodiment of the present application;

[0009] Figure 3 FIG. 3 is a schematic diagram of a verification device according to still another embodiment of the present application;

[0010] Figure 4 FIG. 4 is a schematic diagram of a verification device according to yet another embodiment of the present application;

[0011] Figure 5 FIG. 5 is a flowchart of a verification method according to an embodiment of the present application; and

[0012] Figure 6 FIG. 6 is a flowchart of a verification method according to another embodiment of the present application.

[0013] 101, liquid metal container; 102, heating component; 103, calibration container; 104, liquid level meter to be calibrated; 105, calibration probe assembly; 1051, movable calibration probe; 1052, probe driving mechanism; 106, first pipeline; 1061, first valve; 1062, second valve; 107, liquid metal driving device; 108, first electric couple beam; 109, second electric couple beam; 110, second pipeline; 1101, third valve; 1102, fourth valve; 111, vacuum pump; 112, third pipeline; 1121, fifth valve; 1122, sixth valve; 113, heat preservation container; 114, heating wire; 115, first pressure gauge; 116, second pressure gauge. DETAILED DESCRIPTION

[0014] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are one embodiment of the present application, rather than all the embodiments of the present application. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art without any creative effort fall within the scope of protection of the present application.

[0015] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present application should be understood as the common meanings understood by those skilled in the art in the field of the present application. If the descriptions of “first”, “second” and the like are involved throughout the text, the “first”, “second” and the like are only used to distinguish similar objects, and cannot be understood as indicating or implying relative importance, sequence or implicitly indicating the number of the indicated technical features, and it should be understood that the data of “first”, “second” and the like can be interchanged under appropriate circumstances. If “and / or” appears throughout the text, it means that three parallel schemes are included, for example, “A and / or B” includes A scheme, or B scheme, or A and B are satisfied at the same time.

[0016] The embodiments of the present application provide a calibration device for calibrating a mutual inductor type liquid metal liquid level meter.

[0017] As shown in Figure 1 The calibration device includes a liquid metal container 101, a heating component 102, a calibration container 103, a liquid level meter to be calibrated 104, a calibration probe assembly 105, a first pipeline 106, and a liquid metal driving device 107.

[0018] The liquid metal container 101 is used for heating and storing liquid metal, and a heating component 102 is arranged inside the liquid metal container 101. The heating component 102 is in L shape and is vertically inserted into the inside of the liquid metal container 101. The shorter end of the L-shaped heating component 102 is adjacent to the bottom of the liquid metal container 101, and the longer end can be adjacent to the right side of the liquid metal container 101 or the left side, which is not limited here.

[0019] During the heating process, the liquid metal at different liquid levels will appear thermal stratification phenomenon due to the change of temperature gradient. The L-shaped heating component 102 not only can fully contact with the liquid metal, but also can focus on heating the liquid metal with greater density at the bottom of the liquid metal container 101, so as to reduce the phenomenon of thermal stratification.

[0020] The inside of the checking container 103 is provided with a to-be-checked liquid level meter 104 and a checking probe assembly 105. The to-be-checked liquid level meter 104 is vertically inserted into the inside of the checking container 103 and keeps a safe distance from the bottom of the checking container 103. The checking probe assembly 105 is adjacent to and parallel to the to-be-checked liquid level meter 104.

[0021] Further, the checking probe assembly 105 includes a movable calibration probe 1051 and a probe driving mechanism 1052. The movable calibration probe 1051 is connected with the probe driving mechanism 1052, and the probe driving mechanism 1052 can drive the movable calibration probe 1051 to move up and down in the checking container 103 to contact with the liquid metal in the checking container 103. The probe driving mechanism 1052 can be a hydraulic rod. The movable calibration probe 1051 is provided with a liquid calibration value. With the up and down movement of the movable calibration probe 1051, the liquid level of the liquid metal is determined by the liquid calibration value. In this embodiment, the movable calibration probe 1051 is selected, which has higher checking accuracy and lower cost in the process of checking the liquid level meter, and has good applicability.

[0022] The bottom of the liquid metal container 101 is provided with a liquid metal outlet; the bottom of the checking container 103 is provided with a first liquid metal outlet, and the right side wall is provided with a second liquid metal outlet. A first pipeline 106 is arranged between the liquid metal container 101 and the checking container 103, and is connected with the liquid metal outlet of the liquid metal container 101 and the first liquid metal outlet of the checking container 103, respectively, for bidirectional conveying of the liquid metal between the liquid metal container 101 and the checking container 103, so as to adjust the liquid level position of the liquid metal in the checking container 103.

[0023] A liquid metal driving device 107 is also provided between the liquid metal container 101 and the calibration container 103. The liquid metal driving device 107 is connected to the second liquid metal inlet / outlet of the calibration container 103. A valve is provided on the connecting pipe of the liquid metal driving device 107. By opening and closing the valve, the liquid metal is transported between the liquid metal container 101 and the calibration container 103. In another embodiment, as... Figure 2 As shown, a first valve 1061 and a second valve 1062 are provided on the first pipeline 106. The first valve 1061 is located on a branch connecting the first pipeline 106 to the liquid metal inlet / outlet of the liquid metal container 101, and is used to deliver liquid metal into or from the liquid metal container 101 to the calibration container 103. The second valve 1062 is located on a branch connecting the first pipeline 106 to the first liquid metal inlet / outlet of the calibration container 103, and is used to deliver liquid metal into or from the calibration container 103 to the liquid metal container 101. The opening and closing of the first valve 1061 and the second valve 1062 facilitates the transfer of liquid metal between the liquid metal container 101 and the calibration container 103. In some embodiments, the liquid driving device can be an electromagnetic pump.

[0024] The first pipeline 106 is also provided with a liquid metal outlet, located between the first valve 1061 and the second valve 1062, which is used to discharge the liquid metal in the liquid metal container 101 and the calibration container 103 after the liquid level gauge 104 to be calibrated is calibrated.

[0025] A liquid metal driving device 107 is also provided between the liquid metal container 101 and the calibration container 103. One end of the liquid metal driving device 107 is connected to the second liquid metal inlet / outlet of the calibration container 103, and the other end can be connected to the branch between the first valve 1061 and the second valve 1062 in the first pipeline 106, or it can be connected to other positions in the branch where the first valve 1061 and the second valve 1062 are located, which is not limited here. The liquid metal driving device 107 is used to agitate the liquid metal in the calibration container 103, so that the liquid metal in the calibration container 103 maintains a uniform temperature.

[0026] In some embodiments, the heating element 102 heats the liquid metal in the liquid metal container 101 to the calibration temperature, and then transports it to the calibration container 103 through the first pipeline 106, thereby calibrating the level gauge 104 to be calibrated based on the calibration probe assembly 105 in the calibration container 103. The calibration temperature can be set to 500°C.

[0027] During the calibration process, the liquid metal driving device 107 continuously stirs the liquid metal in the calibration container 103, effectively reducing the thermal stratification phenomenon caused by the temperature gradient of the liquid metal at different liquid levels, and improving the calibration accuracy of the to-be-calibrated level meter 104. By using the calibration value of the calibration probe assembly 105 to calibrate the to-be-calibrated level meter 104, the calibration result is more accurate and intuitive.

[0028] In some embodiments, as shown in Figure 2 The calibration device further includes a first thermocouple beam 108 and a second thermocouple beam 109. The first thermocouple beam is arranged in the liquid metal container 101 and is used to detect the temperature distribution of the liquid metal in the liquid metal container 101 to determine whether the detected temperature meets the detection condition of the to-be-calibrated level meter 104. The second thermocouple beam is arranged in the calibration container 103 and is used to detect the temperature distribution of the liquid metal in the calibration container 103 to determine whether the liquid metal is heated to the calibration temperature, so as to facilitate subsequent detection of the to-be-calibrated level meter 104. The thermocouple beams are uniformly distributed along the vertical height in the calibration container 103 and the liquid metal container 101. The thermocouple beams can be multiple.

[0029] In some embodiments, if the second thermocouple beam detects that the temperature of the liquid metal in the calibration container 103 is lower than the preset detection temperature, the liquid metal needs to be transferred to the liquid metal container 101 and heated to the calibration temperature by the heating component 102 to ensure the calibration accuracy of the to-be-calibrated level meter 104.

[0030] The real-time detection of the temperature of the liquid metal in the liquid metal container 101 and the calibration container 103 by the thermocouple beams ensures that the temperature of the liquid metal can always be maintained at the standard calibration temperature, thereby making the calibration of the to-be-calibrated level meter 104 more accurate.

[0031] In some embodiments, as shown in Figure 3 In some embodiments, air inlets and outlets are arranged at the top of the liquid metal container 101 and the calibration container 103. In some embodiments, the calibration device further includes a second pipeline 110. The second pipeline 110 is arranged between the liquid metal container 101 and the calibration container 103 and is connected to the air inlets and outlets of the liquid metal container 101 and the calibration container 103, respectively. The second pipeline 110 is used to transfer the air in the liquid metal container 101 and the calibration container 103.

[0032] Further, the second pipeline 110 is provided with a third valve 1101 and a fourth valve 1102. The third valve 1101 is arranged on a branch of the second pipeline 110 connected to the air outlet of the liquid metal container 101, and is used to discharge air in the liquid metal container 101. The fourth valve 1102 is arranged on a branch of the second pipeline 110 connected to the air outlet of the calibration container 103, and is used to discharge air in the calibration container 103.

[0033] In some embodiments, the second pipeline 110 is further provided with a vacuum pump 111, which is used to extract air in the liquid metal container 101 and the calibration container 103, and discharge the extracted air, so that the liquid metal container 101 and the calibration container 103 are in a vacuum state.

[0034] By extracting air in the tank, the pressure in the liquid metal container 101 and the calibration container 103 is changed, a pressure difference is generated between the two tanks, and then the liquid metal can be transmitted through the first pipeline 106, so that the liquid level of the liquid metal reaches the position of the preset detection point.

[0035] The liquid metal container 101 and the calibration container 103 are both provided with an inert gas inlet and outlet at the top, which are adjacent to the air inlets and outlets. In some embodiments, the calibration device further comprises a third pipeline 112. The third pipeline 112 is arranged between the liquid metal container 101 and the calibration container 103, and the third pipeline 112 comprises two branches. One end of one branch is connected to the inert gas inlet of the liquid metal container 101, and the other end of the other branch is connected to the inert gas inlet of the calibration container 103. The other ends of the two branches are both connected to an inert gas container for providing inert gas, so as to transport inert gas into the liquid metal container 101 and the calibration container 103.

[0036] Further, the third pipeline 112 is provided with a fifth valve 1121 and a sixth valve 1122. The fifth valve 1121 is arranged on a branch of the third pipeline 112 connected to the inert gas inlet of the liquid metal container 101, and is used to transport inert gas into the liquid metal container 101. The sixth valve 1122 is arranged on a branch of the third pipeline 112 connected to the inert gas inlet of the calibration container 103, and is used to transport inert gas into the calibration container 103.

[0037] The delivery of the inert gas between the liquid metal container 101 and the verification container 103 is completed by opening and closing of the fifth valve 1121 and the sixth valve 1122. By delivering the inert gas into the tank, the inert gas is stable in nature, effectively reducing the reaction of the liquid metal with air, and delivering the inert gas into the tank can change the pressure in the liquid metal container 101 and the verification container 103, so that the two tanks generate a pressure difference, and then the liquid metal can be transmitted through the first pipeline 106, so that the liquid level of the liquid metal reaches the position of the preset detection point.

[0038] In some embodiments, the materials of the verification container 103, the liquid metal container 101, the first pipeline 106, the second pipeline 110, the third pipeline 112, and all the valves are preferably stainless steel, which is beneficial to the compatibility of the liquid metal.

[0039] In some embodiments, as shown in Figure 4 The verification device further includes a heat preservation container 113, a heating wire 114, a first pressure gauge 115, and a second pressure gauge 116. The liquid metal container 101, the verification container 103, the first pipeline 106, and the liquid metal driving device 107 are all arranged in the heat preservation container 113. The heating wire 114 is arranged in the heat preservation container 113, and is used to reduce the temperature change of the liquid metal during the delivery of the liquid metal between the liquid metal container 101 and the verification container 103 through the first pipeline 106.

[0040] The first pressure gauge 115 is arranged on the liquid metal container 101, and is used to detect the pressure in the liquid metal container 101. The second pressure gauge 116 is arranged on the verification container 103, and is used to detect the pressure in the verification container 103. In this embodiment, the verification result of the liquid level meter 104 to be verified is output by the pressure value, and by comparing the pressure values of the first pressure gauge 115 and the second pressure gauge 116, the pressure difference between the liquid metal container 101 and the verification container 103 can be directly obtained, which is beneficial to the transmission of the liquid metal between the two tanks, so that the liquid level of the liquid metal reaches the position of the preset detection point.

[0041] Figure 5 A flow chart of a verification method according to an embodiment of the present disclosure is schematically shown.

[0042] Embodiments of the present application also provide a verification method, which uses a verification device to verify a liquid metal liquid level meter.

[0043] As shown in Figure 5 The verification method includes operations S201-S206.

[0044] In operation S201, the liquid metal in the verification container 103 is delivered to the liquid metal container 101 through the first pipeline 106.

[0045] In operation S202, the liquid metal in the liquid metal container 101 is heated to a working temperature required for calibration by the heating component 102.

[0046] In operation S203, the heated liquid metal is delivered to the calibration container 103 through the first pipeline 106.

[0047] In operation S204, the liquid metal driving device 107 is turned on to agitate the liquid metal in the calibration container 103 so that the temperature of the liquid metal in the calibration container 103 is constant.

[0048] In operation S205, the calibration probe assembly 105 is driven until the calibration probe assembly 105 reaches a preset detection position of the liquid metal in the calibration container 103 and generates an induction signal to obtain a calibration value of the calibration probe assembly 105.

[0049] In operation S206, the calibration value of the calibration probe assembly 105 is used to calibrate the liquid level meter to be calibrated 104 to obtain a liquid level indication of the liquid level meter to be calibrated 104 at the preset detection position.

[0050] In some embodiments, the liquid metal in the calibration container 103 is sodium-potassium alloy, the sodium-potassium alloy is delivered to the liquid metal container 101 through the first pipeline 106, and the sodium-potassium alloy is heated to a working temperature required for calibration by the heating component 102 in the liquid metal container 101, which is 500°C. After the sodium-potassium alloy is heated to the working temperature, it is delivered to the calibration container 103 through the first pipeline 106.

[0051] After being delivered to the calibration container 103, the liquid metal driving device 107 is turned on to agitate the sodium-potassium alloy in the calibration container 103 by the liquid metal driving device 107 so that the temperature of the sodium-potassium alloy is constant and does not produce thermal stratification due to the high working temperature.

[0052] The calibration probe assembly 105 is driven to start calibrating the liquid level of the liquid metal, the calibration range is 0-1500mm, and the required calibration detection points are 0mm, 300mm, 600mm, 900mm, 1200mm, and 1500mm. The liquid level of the zero point (0mm) of the liquid level meter to be calibrated 104 and the liquid level of the full-scale range (1500mm) of the liquid level meter to be calibrated 104 are determined before calibration.

[0053] The calibration probe assembly 105 is driven to move up and down until the calibration probe assembly 105 reaches a preset detection position of the liquid metal in the calibration container 103 and generates an induction signal to obtain a calibration value of the calibration probe assembly 105 at each calibration detection point. The calibration value of the calibration probe assembly 105 is used to calibrate the liquid level meter to be calibrated 104 to obtain a liquid level indication of the liquid level meter to be calibrated 104 at each calibration detection point.

[0054] By using this method to check the to-be-checked liquid level meter 104, the checking accuracy is relatively high, better than 1% in the whole checking range, and the data consistency is good. In the operation process, the performance is stable, and the operation is convenient.

[0055] By using the calibration value of the checking probe assembly 105 to check the to-be-checked liquid level meter 104, the checking result is more accurate and intuitive, and the size of the device is effectively reduced, so that the safety and economy of the checking device can be considered. In the checking process, the liquid metal driving device 107 is used to stir the liquid metal in the checking container 103, effectively reducing the thermal stratification phenomenon caused by the liquid metal at different liquid level heights due to the temperature gradient change, meeting the working temperature requirement of the to-be-checked liquid level meter 104, and improving the checking accuracy.

[0056] As shown in FIG. 7, the checking method further includes operations S207-S209. Figure 6

[0057] In operation S207, after the liquid metal driving device 107 stirs the liquid metal, in the case that the temperature of the liquid metal in the checking container 103 decreases, the liquid metal in the checking container 103 is transported to the liquid metal container 101 through the first pipeline 106.

[0058] In operation S208, the liquid metal in the liquid metal container 101 is heated to the required working temperature for checking by using the heating pump.

[0059] In operation S209, the heated liquid metal is transported to the checking container 103 through the first pipeline 106, until the temperature of the liquid metal in the checking container 103 is constant at the working temperature.

[0060] In some embodiments, after the liquid metal driving device 107 stirs the liquid metal, if it is detected that the temperature of the liquid metal in the checking container 103 decreases, the liquid metal in the checking container 103 is transported to the liquid metal container 101 through the first pipeline 106, and the liquid metal is heated again to the required working temperature for checking by using the heating pump in the liquid metal container 101.

[0061] The heated liquid metal is transported to the checking container 103 through the first pipeline 106, until the temperature of the liquid metal in the checking container 103 is constant at the working temperature. The constant working temperature makes the liquid metal not change in density due to uneven heat, thereby generating thermal stratification and affecting the checking accuracy.

[0062] In some embodiments, the checking method further includes the following operations.

[0063] ​By adjusting the pressure difference between the liquid metal container 101 and the calibration container 103, the transmission direction of the liquid metal between the liquid metal container 101 and the calibration container 103 is controlled, so that the liquid level of the liquid metal in the calibration container 103 reaches the position of the preset detection point.

[0064] In some embodiments, by adjusting the pressure difference between the liquid metal container 101 and the calibration container 103, the transmission direction of the liquid metal between the liquid metal container 101 and the calibration container 103 is controlled. If the pressure in the calibration container 103 is greater than the pressure in the liquid metal container 101, the liquid metal in the calibration container 103 can be transmitted into the liquid metal container 101. If the pressure in the calibration container 103 is less than the pressure in the liquid metal container 101, the liquid metal in the liquid metal container 101 can be transmitted into the calibration container 103, thereby completing the transmission of the liquid metal, so that the liquid level of the liquid metal reaches the position of the preset detection point. By using this method to transmit the liquid metal, it is convenient to operate, and it is not necessary to input or discharge the liquid metal multiple times.

[0065] The application has been described in detail above with reference to the drawings and embodiments, but the application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application. The contents not described in detail in the application can adopt the prior art.

Claims

1. A verification device for verifying a mutual inductance type liquid metal level gauge, characterized by comprising: It includes: A liquid metal container, which is internally provided with a heating component for heating the liquid metal in the liquid metal container to a working temperature required for calibration; A calibration container for placing the mutual inductance type liquid metal level meter to be calibrated, which is internally provided with a calibration probe assembly for calibrating the mutual inductance type liquid metal level meter to be calibrated by using the calibration value of the calibration probe assembly; A first pipeline arranged between the liquid metal container and the calibration container and connected with the liquid metal inlet and outlet of the liquid metal container and the first liquid metal inlet and outlet of the calibration container respectively, for bidirectional transportation of the liquid metal between the liquid metal container and the calibration container; A liquid metal driving device connected with the first pipeline and the second liquid metal inlet and outlet of the calibration container, for driving the liquid metal in the calibration container to mix, so that the liquid metal in the calibration container maintains a uniform temperature; After the liquid metal is agitated by the liquid metal driving device, in the case that the temperature of the liquid metal in the calibration container decreases, the liquid metal in the calibration container is transported to the liquid metal container through the first pipeline; The liquid metal in the liquid metal container is heated to the working temperature required for calibration by using the heating component; The heated liquid metal is transported to the calibration container through the first pipeline until the temperature of the liquid metal in the calibration container is constant at the working temperature required for calibration.

2. The apparatus of claim 1, wherein, The calibration probe assembly includes: A movable calibration probe for detecting the liquid calibration value of the liquid metal in the calibration container; A probe driving mechanism for driving the movable calibration probe to reach the liquid level of the liquid metal in the calibration container.

3. The apparatus of claim 1, wherein, Further includes: A first thermocouple bundle arranged in the liquid metal container for detecting the temperature distribution of the liquid metal in the liquid metal container; A second thermocouple bundle arranged in the calibration container for detecting the temperature distribution of the liquid metal in the calibration container.

4. The apparatus of claim 1, wherein, The first pipeline is provided with a first valve and a second valve; The first valve is arranged on one side branch of the first pipeline connected with the liquid metal inlet and outlet of the liquid metal container, for transporting the liquid metal into the liquid metal container or from the liquid metal container to the calibration container; The second valve is arranged on one side branch of the first pipeline connected with the first liquid metal inlet and outlet of the calibration container, for transporting the liquid metal into the calibration container or from the calibration container to the liquid metal container.

5. The apparatus of claim 1, wherein, Further includes: A second pipeline arranged between the liquid metal container and the calibration container and connected with the air inlet and outlet of the liquid metal container and the air inlet and outlet of the calibration container respectively; A vacuum pump arranged on the second pipeline for discharging air inside the liquid metal container and the calibration container.

6. The apparatus of claim 5, wherein, The second pipeline is provided with a third valve and a fourth valve; The third valve is arranged on a branch of the second pipeline connected with the air inlet and outlet of the liquid metal container, and is used for discharging air in the liquid metal container. The fourth valve is arranged on a branch of the second pipeline connected with the air inlet and outlet of the calibration container, and is used for discharging air in the calibration container.

7. The apparatus of claim 1, wherein, Further comprising: A third pipeline is arranged between the liquid metal container and the calibration container, and is connected with the inert gas inlet and outlet of the liquid metal container and the calibration container respectively, and is used for conveying inert gas into the liquid metal container and the calibration container.

8. The apparatus of claim 7, wherein, The third pipeline is provided with a fifth valve and a sixth valve. The fifth valve is arranged on a branch of the third pipeline connected with the inert gas inlet and outlet of the liquid metal container, and is used for conveying the inert gas into the liquid metal container. The sixth valve is arranged on a branch of the third pipeline connected with the inert gas inlet and outlet of the calibration container, and is used for conveying the inert gas into the calibration container.

9. The apparatus of claim 1, wherein, Further comprising: A heat preservation container, in which the liquid metal container, the calibration container, the first pipeline and the liquid metal driving device are arranged; A heating wire arranged in the heat preservation container, and used for reducing temperature change of the liquid metal during conveying of the liquid metal between the liquid metal container and the calibration container through the first pipeline.

10. The apparatus of claim 1, wherein, Further comprising: A first pressure gauge arranged on the liquid metal container, and used for detecting pressure in the liquid metal container; A second pressure gauge arranged on the calibration container, and used for detecting pressure in the calibration container.

11. A verification method using the verification device according to any one of claims 1 to 10, characterized by, It comprises: Conveying liquid metal in the calibration container to the liquid metal container through the first pipeline; Heating the liquid metal in the liquid metal container to a working temperature required for calibration by using a heating component; Conveying the heated liquid metal to the calibration container through the first pipeline; Starting the liquid metal driving device to agitate the liquid metal in the calibration container, so that the temperature of the liquid metal in the calibration container is constant; Driving the calibration probe assembly until the calibration probe assembly reaches a preset detection position of the liquid metal in the calibration container, and generating an induction signal to obtain a calibration value of the calibration probe assembly; Calibrating the mutual inductance type liquid metal level meter to be calibrated by using the calibration value of the calibration probe assembly to obtain a liquid level indication of the mutual inductance type liquid metal level meter to be calibrated at the preset detection position.

12. The method according to claim 11, further comprising: After agitating the liquid metal by using the liquid metal driving device, in the case that the temperature of the liquid metal in the calibration container decreases, conveying the liquid metal in the calibration container to the liquid metal container through the first pipeline; Heating the liquid metal in the liquid metal container to the working temperature required for calibration by using the heating component; The heated liquid metal is delivered through the first pipeline to the calibration container until the temperature of the liquid metal in the calibration container is constant at the working temperature required for calibration.

13. The method of claim 11, further comprising: The direction of the liquid metal transmission between the liquid metal container and the calibration container is controlled by adjusting the pressure difference between the liquid metal container and the calibration container, so that the liquid level of the liquid metal in the calibration container reaches the preset detection position.

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