Device for detecting leakage of molten salt heat storage tank and working method of device

Abstract

The invention belongs to the technical field of fused salt heat storage tank leakage detection, and discloses a device for fused salt heat storage tank leakage detection and a working method thereof. According to the device for detecting the leakage of the fused salt heat storage tank, a rotary supporting assembly is rotatably mounted on a base, and an equipment mounting frame is further mounted on the base; a plurality of spray heads and a plurality of cameras are arranged on the equipment mounting rack; one end of the detection cylinder is provided with a detection pipe and an air inlet pipe, and the other end is provided with an air outlet; one end provided with the air outlet is provided with a distance sensor, and the other end provided with the air outlet is further provided with a piston plate through an elastic assembly; the control unit is used for controlling rotation of the rotary supporting assembly, controlling opening and closing of the spray head, obtaining data collected by the distance sensor and obtaining data collected by the camera. According to the technical scheme, bubble visual monitoring and pressure change monitoring are combined, and the sensitivity and accuracy of leakage detection are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of leakage detection of molten salt heat storage tanks, and in particular relates to a device for leakage detection of molten salt heat storage tanks and a working method thereof. Background Art

[0002] The molten salt heat storage system is currently the most widely used heat storage system. Compared with the technical solution using water as the absorber working fluid, using molten salt as the absorber working fluid has many advantages. Specifically, the molten salt working fluid does not undergo phase change during the process of heat absorption, heat transfer, and heat storage, which can simplify the process of tower solar thermal power generation system and greatly increase the heat storage capacity.

[0003] The molten salt heat storage tanks in a molten salt heat storage system require a sealing performance test before commissioning. This is primarily to ensure the safe and stable operation of the heat storage system and prevent accidents caused by molten salt leaks. Specifically, molten salt heat storage tanks operate in a high-temperature (290°C to 1000°C) and high-pressure environment, and molten salt is highly corrosive. A leak could not only cause molten salt loss but also corrode equipment, pollute the environment, and even cause safety incidents such as explosions. Sealing performance testing can promptly detect and repair sealing defects in the tank and its connections, ensuring the long-term, reliable operation of the heat storage system.

[0004] At present, in the existing leakage detection scheme for molten salt heat storage tanks, the tank body is generally pressurized and sealed first, and then soapy water or other detection substances are sprayed on the outer wall and top wall of the tank body. The sealing performance of the molten salt heat storage tank is judged by observing whether there is foam in the soapy water or other detection substances. Although the above-mentioned existing leakage detection scheme for molten salt heat storage tanks can realize the sealing performance test, there are still some problems to be solved, mainly including: low detection sensitivity, and difficulty in detecting small leaks (explanatory, soapy water detection relies on the formation of visible foam after the leaking gas or liquid contacts soapy water; however, the leakage of the molten salt heat storage tank may be a trace leakage caused by tiny cracks or aging of the seals. The leakage volume is extremely small, and it is difficult to form bubbles large enough or continuous foam); low detection efficiency, time-consuming and labor-intensive (explanatory, it is necessary to manually spray soapy water and observe each area, which is inefficient, especially for large heat storage tanks). Tanks can reach tens of meters in diameter, and testing takes hours or even days. Furthermore, manual operation makes it difficult to ensure uniform spraying, which may miss some areas and cause leaks to go undetected. Furthermore, some larger tanks are difficult for inspectors to observe, and when a leak occurs, inspectors cannot promptly understand the situation, resulting in reduced leak detection efficiency and reliability. It is impossible to quantify the extent of the leak, making it difficult to assess the risk. (Explanatoryly, soapy water testing can only determine whether a leak exists, but cannot quantify the leak rate or amount, making it difficult to assess the severity of the leak and its impact on system safety.) Summary of the Invention

[0005] The present invention aims to provide a device and operating method for leak detection in molten salt heat storage tanks, thereby resolving one or more of the aforementioned technical problems. Through integrated design and intelligent control, the present invention's technical solution automates the detection process and optimises the accuracy of test results, resolving the aforementioned existing technical issues. It is important to note that the present invention combines bubble visual monitoring with pressure change monitoring, improving the sensitivity and accuracy of leak detection through multi-source data fusion analysis, and providing a strong guarantee for the safe operation of molten salt heat storage systems.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect of the present invention, a device for detecting leakage of a molten salt heat storage tank is provided, comprising: a base, a rotating support assembly, an equipment mounting frame, a detection cylinder, and a control unit; wherein, The base is rotatably mounted with the rotating support assembly, and the rotating support assembly is used to place the tank body of the molten salt heat storage tank to be leak tested; The base is provided with a device mounting frame; the device mounting frame is provided with a plurality of nozzles, which are used to spray a detection liquid onto a predetermined outer wall surface area of ​​the tank body, wherein the detection liquid is capable of forming bubbles at the leakage location of the tank body; the device mounting frame is also provided with a plurality of cameras, which are used to monitor the generation of bubbles on the outer wall surface of the tank body; One end of the detection cylinder is provided with a detection tube and an air inlet pipe, and the other end is provided with an air outlet; the end provided with the air outlet is installed with a distance sensor, and the end provided with the air outlet is also installed with a piston plate through an elastic component, and the piston plate can slide in the detection cylinder; wherein, the detection tube is used to be connected to the inlet of the tank body; the air inlet pipe is used to pressurize the tank body during detection and is shut off when the pressure reaches a preset pressure threshold; the distance sensor is used to detect the distance between the piston plate and the distance sensor during the detection process; The control unit is used to control the rotation of the rotating support assembly, to control the opening and closing of the nozzle, to obtain the data collected by the distance sensor, and to obtain the data collected by the camera.

[0007] A further improvement of the technical solution of the present invention is that the rotating support assembly includes a fixed seat installed on the base; a motor is installed in the fixed seat, the output shaft of the motor is fixedly connected to the rotating shaft, and a rotating frame is installed on the rotating shaft, and the rotating frame is used to place the tank body of the molten salt heat storage tank to be leak tested.

[0008] A further improvement of the technical solution of the present invention is that a plurality of groups of protrusions distributed in a ring shape are installed on the rotating frame.

[0009] A further improvement of the technical solution of the present invention is that the elastic component includes a fixed cylinder installed on the inner wall of the detection cylinder; a slide plate is slidably arranged in the fixed cylinder, and the slide plate is fixedly connected to a slide rod, and the slide rod is used to connect the piston plate; wherein a spring connected to the slide plate is arranged in the fixed cylinder.

[0010] A further improvement of the technical solution of the present invention is that a sealing member is provided between the detection cylinder and the detection tube.

[0011] A further improvement of the technical solution of the present invention is that it further comprises: a liquid storage tank; the liquid storage tank is connected to the nozzle through a delivery pipe, and a water pump is provided on the delivery pipe.

[0012] A further improvement of the technical solution of the present invention is that it further includes: a display device; the display device is used to display the collected data of the distance sensor and the collected data of the camera obtained by the control unit.

[0013] A further improvement of the technical solution of the present invention is that it further comprises: an alarm device; the alarm device is used to issue alarms of different levels according to a preset threshold range and data collected by the distance sensor.

[0014] A second aspect of the present invention provides a method for detecting leakage of a molten salt heat storage tank, comprising the following steps: The tank body of the molten salt heat storage tank to be leak tested is placed on the rotating support assembly, and the detection cylinder is installed at the inlet of the tank body through the detection tube; The tank body is pressurized through an air inlet pipe. After the pressure reaches a preset threshold, the air inlet pipe is closed. The control unit obtains the initial value collected by the distance sensor and controls the nozzle to open and the rotating support assembly to rotate, spraying the detection liquid onto a preset outer wall surface area of ​​the tank body. After the spraying is completed, the nozzle is controlled to close and the rotating support assembly is controlled to stop rotating. Static detection, output detection results; wherein, the detection results include: the change in the acquisition value compared to the initial distance sensor acquisition value at each preset moment or time period; and the camera's acquisition data at the moment or time period when the acquisition value change exceeds the preset threshold.

[0015] A further improvement of the technical solution of the present invention is that the detection result also includes: a leakage level determined according to the variation of the collected value and a preset variation grading range.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention proposes an integrated and intelligent device for leak detection of molten salt heat storage tanks, which realizes efficient and accurate leak detection through the collaborative work of multiple components. Specifically, the device of the present invention integrates a rotating support assembly, a spraying system, a camera monitoring system, a pressure detection system and a control unit into one, avoiding the problem of dispersed operation of multiple devices in traditional detection, reducing the space occupied by the equipment and the installation and debugging time, and only needs to use the control unit to complete the whole process operations such as tank rotation, spraying detection liquid, bubble monitoring and pressure data collection, which significantly improves the detection efficiency. In the present invention, the control unit can automatically control the rotation speed and direction of the rotating support assembly, as well as the opening and closing time and spraying area of ​​the nozzle, reducing manual intervention, reducing the difficulty of operation and human error; in addition, through the preset program, the standardization and repeatability of the detection process can be achieved, ensuring that the conditions of each detection are consistent, and improving the reliability of the detection results.

[0017] To further explain, in the technical solution of the present invention, the nozzle sprays the detection liquid onto the preset outer wall surface area of ​​the tank body, and the camera monitors the bubble generation in real time. Since the leakage of the molten salt heat storage tank is usually a trace leakage caused by tiny cracks or aging of the seals, the bubble visualization monitoring can intuitively reflect the leakage location and degree, thereby improving the detection sensitivity; the present invention drives the tank body to rotate through the rotating support assembly, and the nozzle and camera can perform 360-degree no-dead-angle detection of the tank body, avoiding the problem of missed detection caused by the complex tank structure in traditional detection.

[0018] To further explain, in the technical solution of the present invention, the detection cylinder is connected to the tank inlet through a detection tube. The air inlet pipe pressurizes the tank to a preset pressure threshold and then shuts off. If there is a leak in the tank, the pressure inside the tank will drop, pushing the piston plate to move. The distance sensor detects the change in distance between the piston plate and the distance sensor in real time, thereby quantifying the leak rate. Bubble monitoring and pressure monitoring complement each other. Bubble monitoring can quickly locate the leak point, and pressure monitoring can quantify the leak level, improving the accuracy and reliability of the test results.

[0019] To further explain, in the technical solution of the present invention, the control unit simultaneously obtains the data collected by the distance sensor and the camera, and uses an algorithm to fuse and analyze the bubble generation and pressure change data, which can more accurately determine the location and extent of the leak. The present invention can preset the leakage threshold. When a leak is detected, the control unit automatically issues an alarm, prompting the operator to deal with it in time, thus avoiding the escalation of the accident. In addition, the control unit can store the data of each detection, including bubble images, pressure change curves, etc., to facilitate subsequent analysis and tracing; by analyzing historical data, the patterns and trends of tank leakage can be discovered, providing support for equipment maintenance and fault diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below; obviously, the drawings described below are some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 1 is a schematic structural diagram of a device for detecting leakage of a molten salt heat storage tank in an embodiment of the present invention; Figure 2 is a schematic top view of a rotating frame and a protrusion in an embodiment of the present invention; Figure 3 1 is a schematic diagram of the internal structure of the detection tube in an embodiment of the present invention; Figure 4 yes Figure 3 In the embodiment shown, a partial enlarged schematic diagram of point A; The explanations of the reference numerals in the figure are as follows: 1. Base; 2. Fixed seat; 3. Motor; 4. Rotating shaft; 5. Rotating frame; 6. Protrusion; 7. Support frame; 8. Equipment mounting frame; 9. Nozzle; 10. Delivery pipe; 11. Water pump; 12. Liquid storage tank; 13. Detection tube; 14. Detection cylinder; 15. Air intake pipe; 16. Connector; 17. Sealing rubber ring; 18. Piston plate; 19. Distance sensor; 20. Fixed cylinder; 21. Spring; 22. Slide plate; 23. Slide rod; 24. Tank body; 25. Camera. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments and technical solutions are only part of the embodiments of the present invention, not all of the embodiments.

[0023] All other embodiments obtained by persons of ordinary skill in the art based on the technical solutions disclosed in the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products, or apparatuses.

[0024] An embodiment of the present invention provides a device for detecting leakage of a molten salt heat storage tank, comprising: a base 1, a rotating support assembly, a support frame 7, an equipment mounting frame 8, a detection tube 14, and a control unit; wherein, The base 1 is rotatably mounted with the rotating support assembly, which is used to place the tank body 24 of the molten salt heat storage tank to be leak tested; explanatory, the rotating support assembly is provided on the base 1 for supporting and rotating the tank body 24; The base 1 is mounted with the equipment mounting frame 8 via the support frame 7; the equipment mounting frame 8 is provided with a plurality of nozzles 9, which are used to spray a detection liquid onto a predetermined outer wall surface area of ​​the tank body 24, wherein the detection liquid is capable of forming bubbles at the leakage location of the tank body 24; the equipment mounting frame 8 is also provided with a plurality of cameras 25, which are used to monitor the bubble generation on the outer wall surface of the tank body 24 and output a video or image; One end of the detection cylinder 14 is provided with a detection tube 13 and an air inlet pipe 15, and the other end is provided with an air outlet; a distance sensor 19 is installed at the end provided with the air outlet, and a piston plate 18 is slidably installed through an elastic component; wherein, the detection tube 13 is used to be connected to the inlet of the tank body 24; the air inlet pipe 15 is used to pressurize the tank body 24 during detection, and is shut off when the pressure reaches a preset pressure threshold; the distance sensor 19 is used to detect the distance between the piston plate 18 and the distance sensor 19 during the detection process; in principle, the elastic component is connected to the piston plate 18 to provide elastic supporting force for the piston plate 18. When the pressure in the tank body 24 changes, the distance between the piston plate 18 and the distance sensor 19 will change; The control unit is used to control the rotation of the rotary support assembly, to control the opening and closing of the nozzle 9 , to obtain the data collected by the distance sensor 19 , and to obtain the data collected by the camera 25 .

[0025] Traditional molten salt heat storage tank leakage detection mostly relies on manual operation or a single detection method. The embodiment of the present invention realizes the automation of the detection process and the precision of the detection results through integrated design and intelligent control, filling the market gap. In the embodiment of the present invention, bubble visualization monitoring is combined with pressure change monitoring, and the sensitivity and accuracy of leakage detection are improved through multi-source data fusion analysis, providing a strong guarantee for the safe operation of the molten salt heat storage system. The technical solution of the embodiment of the present invention significantly improves the efficiency, accuracy and safety of molten salt heat storage tank leakage detection through integrated design, multi-dimensional detection, intelligent data processing and other technical means. Its advantages and progress are not only reflected in the technical level, but also provide users with convenient, reliable and efficient solutions in practical applications, and have broad market application prospects.

[0026] In the technical solution of the embodiment of the present invention, the control unit simultaneously obtains the data collected by the distance sensor and the camera, and uses an algorithm to fuse and analyze the bubble generation and pressure change data, which can more accurately determine the location and extent of the leak. The present invention can preset the leakage threshold. When a leak is detected, the control unit automatically issues an alarm, prompting the operator to deal with it in time, thus avoiding the escalation of the accident. In addition, the control unit can store the data of each detection, including bubble images, pressure change curves, etc., to facilitate subsequent analysis and tracing; by analyzing historical data, the patterns and trends of tank leakage can be discovered, providing support for equipment maintenance and fault diagnosis.

[0027] As a preferred technical solution of an embodiment of the present invention, the elastic component includes a fixed cylinder 20 mounted on the inner wall of the detection cylinder 14. A slide plate 22 is slidably disposed within the fixed cylinder 20. The slide plate 22 is fixedly connected to a slide rod 23, which is fixedly connected to the piston plate 18. A spring 21 connected to the slide plate 22 is disposed within the fixed cylinder 20. Explanatoryally, when the tank body 24 is pressurized and sealed via the air inlet pipe 15, the piston plate 18 is subjected to pressure and moves due to the increase in pressure, pushing the slide rod 23, causing the slide plate 22 to squeeze the spring 21. At this time, the distance between the slide plate 22 and the piston plate 18 is detected by the distance sensor 19. After the tank body 24 is pressurized and sealed, the position of the piston plate 18 remains fixed. However, when a leak occurs, the pressure on the piston plate 18 decreases due to the air pressure leakage. At this time, under the action of the spring 21, the slide plate 22 pushes the slide rod 23 to move, causing the piston plate 18 to also move, thereby causing the distance data detected by the distance sensor 19 to change.

[0028] As a preferred technical solution of an embodiment of the present invention, the rotating support assembly includes a fixed base 2 mounted on a base 1, a motor 3 mounted within the fixed base 2, the output shaft of the motor 3 being fixedly connected to a rotating shaft 4, a rotating frame 5 mounted on the rotating shaft 4, and a plurality of groups of annularly distributed protrusions 6 mounted on the rotating frame 5. Explanatoryally, the protrusions 6 on the rotating frame 5 support the tank body 24, and the rotating shaft 4 is driven to rotate by the motor 3, causing the rotating frame 5 to rotate, thereby driving the tank body 24 to rotate. This allows the soapy water sprayed from the nozzle 9 to cover the outer surface of the tank body 24, and also facilitates the camera 25 to fully capture the surface of the tank body 24, making it easier for inspectors to observe the bubbles in the soapy water.

[0029] As a preferred technical solution of an embodiment of the present invention, liquid storage tanks 12 are installed on both sides of the base 1, and the liquid storage tanks 12 are connected to delivery pipes 10. The delivery pipes 10 are connected to a water pump 11 and a nozzle 9 in sequence. The water pump 11 is connected to the liquid storage tank 12. Explanatoryally, in this embodiment of the present invention, soapy water in the liquid storage tank 12 can be pumped by the water pump 11 and delivered to the nozzle 9 through the delivery pipe 10 for spraying.

[0030] As a preferred technical solution of the present invention, a sealant is provided between the detection cylinder 14 and the detection tube 13, specifically a sealing rubber ring 17. In a specific exemplary technical solution of the present invention, the detection cylinder 14 is connected to the detection tube 13 via a connector 16. The sealing rubber ring 17 is provided within the connector 16, ensuring a sealed connection between the connector 16 and the detection tube 13, preventing air leakage that could affect the detection results.

[0031] See also Figures 1 to 4 The embodiment of the present invention provides a device for detecting leakage of a molten salt heat storage tank, comprising: a base 1 and a tank body 24 of the molten salt heat storage tank to be detected; wherein, Support frames 7 are symmetrically mounted on both sides of the base 1. A device mounting frame 8 (specifically, a U-shaped frame) is mounted on the support frame 7. The device mounting frame 8 is provided with a plurality of nozzles 9 for spraying soapy water onto the surface of the tank 24. Furthermore, the device mounting frame 8 is also provided with one or more cameras 25 for monitoring the soapy water on the surface of the tank 24. The tank body 24 is provided with a detection tube 13 and a detection cylinder 14; wherein, a connector 16 is installed at the bottom of the detection cylinder 14, and the connector 16 is threadedly connected to the detection tube 13. A piston plate 18 is slidably provided in the detection cylinder 14, and an air inlet pipe 15 is provided on one side of the detection cylinder 14. A one-way valve is provided in the air inlet pipe 15 to ensure that only air can be taken in; a distance sensor 19 is installed on the inner wall of the detection cylinder 14; An elastic component connected to the piston plate 18 and used to provide elastic support force for the piston plate 18; The rotating support assembly is arranged on the base 1 and is used to support and rotate the tank body 24.

[0032] In an embodiment of the present invention, when in use, the connector 16 in the detection cylinder 14 is sealed and threadedly connected to the detection tube 13, and then the tank body 24 is pressurized and sealed through the air inlet pipe 15. Due to the pressure in the tank body 24, the position of the piston plate 18 in the detection cylinder 14 changes, and the distance between it and the piston plate 18 is detected by the distance sensor 19, and the data is recorded. Then, the tank body 24 is supported and rotated by the rotating support assembly until the soapy water sprayed from the nozzle 9 completely covers the outer surface of the tank body 24, and the rotating support assembly stops at this time; when the distance data detected by the distance sensor 19 changes, the data change information is transmitted to the display screen, and the inspector begins to drive the tank body 24 to rotate by the rotating support assembly, and cooperates with the camera 25 to observe the bubble generation on the outer surface of the tank body 24, so as to quickly confirm the leakage point. The technical solution of the embodiment of the present invention determines the leakage of the tank body by detecting the piston plate in the cylinder and cooperating with the change of the distance data detected by the distance sensor, and promptly sends information when a leak occurs so that the inspection personnel can observe the bubbles of soapy water on the surface of the tank body in time, thereby quickly locking the leakage point. The setting of the camera allows the inspection personnel to observe the surface of a larger tank body.

[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0034] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A device for detecting leakage of a molten salt heat storage tank, characterized in that: include: A base (1), a rotating support assembly, an equipment mounting frame (8), a detection cylinder (14), and a control unit; wherein, The base (1) is rotatably mounted with the rotating support assembly, and the rotating support assembly is used to place the tank body (24) of the molten salt heat storage tank to be leak tested; The base (1) is provided with the equipment mounting frame (8); the equipment mounting frame (8) is provided with a plurality of nozzles (9), the nozzles (9) being used to spray a detection liquid onto a predetermined outer wall surface area of ​​the tank body (24), the detection liquid being able to form bubbles at a leaking portion of the tank body (24); the equipment mounting frame (8) is also provided with a plurality of cameras (25), the cameras (25) being used to monitor the bubble generation condition on the outer wall surface of the tank body (24); One end of the detection cylinder (14) is provided with a detection tube (13) and an air inlet pipe (15), and the other end is provided with an air outlet; a distance sensor (19) is installed on the end provided with the air outlet, and a piston plate (18) is also installed on the end provided with the air outlet through an elastic component, and the piston plate (18) can slide in the detection cylinder (14); wherein the detection tube (13) is used to be connected to the inlet of the tank body (24); the air inlet pipe (15) is used to pressurize the tank body (24) during detection, and is shut off when the pressure reaches a preset pressure threshold; the distance sensor (19) is used to detect the distance between the piston plate (18) and the distance sensor (19) during the detection process; The control unit is used to control the rotation of the rotary support assembly, to control the opening and closing of the nozzle (9), to obtain the data collected by the distance sensor (19), and to obtain the data collected by the camera (25).

2. The device for detecting leakage of a molten salt heat storage tank according to claim 1, characterized in that: The rotary support assembly comprises a fixed seat (2) mounted on a base (1); a motor (3) is mounted in the fixed seat (2); an output shaft of the motor (3) is fixedly connected to a rotating shaft (4); a rotating frame (5) is mounted on the rotating shaft (4); and the rotating frame (5) is used to place a tank body (24) of a molten salt heat storage tank to be leak tested.

3. The device for detecting leakage of a molten salt heat storage tank according to claim 2, characterized in that: The rotating frame (5) is provided with a plurality of groups of protrusions (6) distributed in an annular shape.

4. The device for detecting leakage of a molten salt heat storage tank according to claim 1, characterized in that: The elastic component comprises a fixed cylinder (20) mounted on the inner wall of the detection cylinder (14); a slide plate (22) is slidably arranged in the fixed cylinder (20), and the slide plate (22) is fixedly connected to a slide rod (23), and the slide rod (23) is used to connect to the piston plate (18); wherein a spring (21) connected to the slide plate (22) is arranged in the fixed cylinder (20).

5. The device for detecting leakage of a molten salt heat storage tank according to claim 1, characterized in that: A sealing member is provided between the detection cylinder (14) and the detection tube (13).

6. The device for detecting leakage of a molten salt heat storage tank according to claim 1, characterized in that: Also includes: A liquid storage tank (12); the liquid storage tank (12) is connected to the nozzle (9) via a delivery pipe (10), and a water pump (11) is provided on the delivery pipe (10).

7. The device for detecting leakage of a molten salt heat storage tank according to claim 1, characterized in that: Also includes: Display device; the display device is used to display the collected data of the distance sensor (19) and the collected data of the camera (25) acquired by the control unit.

8. The device for detecting leakage of a molten salt heat storage tank according to claim 1, characterized in that: Also includes: An alarm device; the alarm device is used to issue alarms of different levels according to a preset threshold range and data collected by a distance sensor (19).

9. A method for operating the device for detecting leakage of a molten salt heat storage tank according to claim 1, characterized in that: The following steps are involved: The tank body (24) of the molten salt heat storage tank to be leak tested is placed on the rotating support assembly, and the detection cylinder (14) is installed at the inlet of the tank body (24) through the detection tube (13); The tank body (24) is pressurized through an air inlet pipe (15), and after the pressure reaches a preset pressure threshold, the air inlet pipe (15) is closed; the control unit obtains an initial distance sensor acquisition value, and controls the nozzle (9) to open and the rotary support assembly to rotate, spraying the detection liquid onto a preset outer wall surface area of ​​the tank body (24); after the spraying is completed, the nozzle (9) is controlled to close, and the rotary support assembly is controlled to stop rotating; Static detection, outputting detection results; wherein the detection results include: the amount of change in the acquisition value compared to the initial distance sensor acquisition value at each preset moment or time period; and the acquisition data of the camera (25) at the moment or time period when the acquisition value change exceeds a preset threshold.

10. The working method of the device for detecting leakage of a molten salt heat storage tank according to claim 9, characterized in that: The detection result also includes: a leakage level determined according to the variation of the collected value and a preset variation grading range.

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