Sampling detection device for low-temperature tank and sampling method

Abstract

The invention relates to the technical field of storage tank sampling, and discloses a sampling detection device for a low-temperature tank and a sampling method.The sampling detection device comprises a low-temperature tank body and a liquid storage tank, the feeding end of the low-temperature tank body is communicated with the discharging end of the liquid storage tank through a pipeline, and the discharging end of the low-temperature tank body is sequentially connected with a buffer cylinder and a circulation assembly; as water flows into the buffer cylinder from the low-temperature tank body, when the interior of the low-temperature tank body is in a high-pressure state, the speed of the water flowing into the buffer cylinder can be increased through strong pressure, the main conveying pipe cannot discharge all the water in time instantly, and at the moment, buoyancy of the water enables the semi-floating ball to support the valve plate to ascend; therefore, the communicating position of the pressure relief sampling pipe and the second cavity is opened, a small part of water can flow to the circulating assembly from the pressure relief sampling pipe, the diameter of the pressure relief sampling pipe is smaller than that of the main conveying pipe, impurities in water flow are concentrated accordingly, and the highly-concentrated impurity distribution state is beneficial for being captured by the detection assembly and detected.

Description

Technical Field

[0001] The present invention relates to the technical field of storage tank sampling, and specifically relates to a sampling detection device and a sampling method for a cryogenic tank. Background Art

[0002] In the design and manufacturing process of a double-layer cryogenic tank, measuring the external pressure data of the inner tank is of great significance. In order to simulate the working state of the tank during its actual service life, the method of repeated filling and discharging is usually adopted to simulate various operating conditions. As a commonly used test medium, water is widely used to simulate the filling and discharging of materials in the cryogenic tank; During the repeated filling and discharging of water tests, impurities will appear in the inner tank. The sources of these impurities are diverse. Some of them come from the residual foreign objects during the manufacturing, transportation or installation of the tank; while the other part may be caused by the deformation of the inner wall when the pressure of the tank changes. And these impurities generated due to the deformation of the inner wall can actually become an important indicator for evaluating whether the cryogenic tank is qualified; However, the current detection methods for impurities in the circulating water flow have limitations. The common practice is to install a filter screen or a filtering device in the main circulation pipeline to intercept and collect impurities. However, this method encounters challenges in actual operation: the water flow state in the main circulation pipeline is complex and changeable, which not only affects the accurate capture of impurities, but also disturbs the purity of the sample. In addition, due to the relatively large cross-sectional area of the flow channel of the main circulation pipeline, those unique impurities generated by the deformation of the inner wall are relatively few in number and unevenly distributed, and are easily covered by the complex water flow state, making it difficult to be effectively detected and identified. Based on this, the present invention purposefully provides a sampling detection device and a sampling method for a cryogenic tank that can accurately sample from circulating water. Summary of the Invention

[0003] The purpose of the present invention is to provide a sampling detection device and a sampling method for a cryogenic tank in view of the deficiencies of the prior art, so as to solve the technical problems in the prior art.

[0004] The purpose of the present invention can be achieved by the following technical solutions: A sampling detection device for a cryogenic tank, which includes a cryogenic tank body and a liquid storage tank. The feeding end of the cryogenic tank body is connected to the discharging end of the liquid storage tank through a pipeline. The discharging end of the cryogenic tank body is successively connected with a buffer cylinder and a circulation component. The circulation component is connected to the liquid storage tank. The cryogenic tank body includes an inner tank body and an outer tank body. The outer tank body is sleeved outside the inner tank body. A monitoring component for monitoring the inner tank body is arranged between the inner tank body and the outer tank body; A first chamber and a second chamber are formed in the buffer cylinder. The bottom ends of the first chamber and the second chamber are communicated. The first chamber is communicated with the low-temperature tank body. The bottom of the buffer cylinder is communicated with the circulation assembly through a main delivery pipe. The side wall of the buffer cylinder is communicated with the circulation assembly through a pressure relief sampling pipe, and a detection assembly is arranged on the pressure relief sampling pipe. The detection assembly is used for detecting the water flowing in the pressure relief sampling pipe. Both the main delivery pipe and the pressure relief sampling pipe are communicated with the second chamber, and the connection between the main delivery pipe and the second chamber is always open. The diameter of the pressure relief sampling pipe is smaller than that of the main delivery pipe; A valve plate is slidably installed in the second chamber. A semi-floating ball is fixedly installed at the bottom of the valve plate. The buoyancy received by the semi-floating ball drives the valve plate to rise. An elastic assembly is arranged in the second chamber. The elastic assembly is connected with the valve plate, and the elastic force of the elastic assembly causes the valve plate to descend. When the buoyancy is less than the elastic force, the valve plate descends to block the connection between the pressure relief sampling pipe and the second chamber. When the buoyancy is greater than the elastic force, the valve plate rises to open the connection between the pressure relief sampling pipe and the second chamber.

[0005] As a further scheme of the present invention: The elastic assembly includes a spring, a movable plate and an adjustment assembly. The movable plate is slidably installed in the second chamber, and the movable plate is close to the top plate of the second chamber. The movable plate is driven by the adjustment assembly to move up and down. The movable plate is connected with the valve plate through a spring. The pre-tightening force of the spring causes the valve plate to descend. A convex block is fixedly installed in the second chamber. The convex block abuts against the valve plate. When the valve plate abuts against the convex block, the valve plate blocks the connection between the pressure relief sampling pipe and the second chamber.

[0006] As a further scheme of the present invention: The adjustment assembly includes a threaded rod, a driving ring, an extension platform and a fixing block. The fixing block is fixedly installed in the second chamber, and the fixing block is slidably connected with the movable plate. The extension platform is fixedly installed at the top of the buffer cylinder. The threaded rod is slidably installed on the extension platform, and one end of the threaded rod extends into the second chamber and is fixedly connected with the movable plate at this end. The driving ring is rotatably installed on the extension platform, and the driving ring is threadedly connected with the threaded rod.

[0007] As a further scheme of the present invention: There is a gap between the outer tank body and the inner tank body. The monitoring assembly includes a fiberglass cloth, an elastic felt and a pressure sensor. The fiberglass cloth is inserted into the gap. The elastic felt is filled between the fiberglass cloth and the inner tank body. The expanded perlite is filled between the fiberglass cloth and the outer tank body. A plurality of pressure sensors are arranged at equal intervals in the expanded perlite, and the pressure sensors are attached to the fiberglass cloth. The fiberglass cloth is connected with the detection assembly.

[0008] As a further scheme of the present invention: The bottom plate of the buffer cylinder is inclined, and the connection between the main delivery pipe and the buffer cylinder is at the lowest horizontal height.

[0009] As a further solution of the present invention: The circulation component includes a collection tank and a processing component. The main delivery pipe and the detection component are both connected to the collection tank. The collection tank is connected to the processing component. The processing component is connected to the feeding end of the liquid storage tank through a pipeline, and the collection tank is located below the cryogenic tank body.

[0010] As a further solution of the present invention: The feeding end and the discharging end of the detection component are respectively installed on the pressure relief sampling pipe through a first flange connection component and a second flange connection component.

[0011] A sampling method for a sampling and detection device for a cryogenic tank. The method is applied to a sampling and detection device for a cryogenic tank as described above. The method includes the following steps: Step S1: First, test the cryogenic tank body. Fill the water in the liquid storage tank into the cryogenic tank body, so that a high pressure is formed in the cryogenic tank body. The high pressure causes the inner tank body to deform, and at the same time, the monitoring component records the deformation of the inner tank body. Step S2: Subsequently, quickly drain the water in the cryogenic tank body into the buffer cylinder. The water will fill the first chamber and the second chamber and flow into the circulation component through the main delivery pipe. Step S3: The high pressure in the cryogenic tank body will accelerate the flow of water into the buffer cylinder. The main delivery pipe cannot drain the water in time. At this time, the buoyancy of the water will cause the semi-floating ball to hold the valve plate up, and the valve plate rises to open the connection between the pressure relief sampling pipe and the second chamber. Step S4: A small part of the water will flow from the pressure relief sampling pipe into the circulation component, and the water flowing through the pressure relief sampling pipe will be detected by the detection component to detect whether impurities that can judge the unqualified cryogenic tank body are generated in the water. Step S5: The circulation component re-transports the water into the liquid storage tank, and the filling and discharging tests of the cryogenic tank body can be repeated.

[0012] The beneficial effects of the present invention: 1. In the present invention, when repeatedly filling and discharging the cryogenic tank body for testing, as the water flows from the cryogenic tank body into the buffer cylinder, when the cryogenic tank body is in a high-pressure state, the strong pressure will accelerate the flow rate of the water into the buffer cylinder, and the main delivery pipe cannot drain all the water in time. At this time, the buoyancy of the water will cause the semi-floating ball to hold the valve plate up, thereby opening the connection between the pressure relief sampling pipe and the second chamber. A small part of the water will flow from the pressure relief sampling pipe into the circulation component, and this part of the water flowing through the pressure relief sampling pipe will be specially detected by the detection component. Since the diameter of the pressure relief sampling pipe is smaller than that of the main delivery pipe, the impurities in the water flow are more concentrated. This highly concentrated impurity distribution state enables the detection component to more efficiently capture the existing unqualified impurities during detection. At the same time, the water flowing through the pressure relief sampling pipe also plays a role in relieving pressure, allowing the high pressure inside the cryogenic tank body to be reasonably released. 2. In the present invention, the pre-tightening force of the spring causes the valve plate to descend, so as to abut against the bump. At this time, water can only flow through the main delivery pipe. As the water volume increases, the buoyancy of the water will push the semi-floating ball upward to drive the valve plate, thereby compressing the spring, and then opening the channel of the pressure relief sampling pipe, allowing water to flow through the pressure relief sampling pipe, achieving the purpose of pressure relief and obtaining a detected water sample. The adjusting assembly can control the lifting of the movable plate. When the movable plate descends, the movable plate will compress the spring, so that the pre-tightening force of the spring on the valve plate increases. At this time, a greater buoyancy or water pressure is required to drive the valve plate to rise by the semi-floating ball. That is to say, it is possible to adjust at what water pressure and buoyancy the channel of the pressure relief sampling pipe will open, so as to control the opening time and the duration of the pressure relief sampling pipe; 3. In the present invention, since the bottom plate of the buffer cylinder is arranged obliquely, after water enters the buffer cylinder, it will flow along the inclined direction of the bottom plate of the buffer cylinder, and the connection between the main delivery pipe and the buffer cylinder is at the lowest horizontal height, so as to ensure that the water is automatically drained in the buffer cylinder and prevent water from remaining in the buffer cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the drawings.

[0014] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the structure of the buffer cylinder in the present invention; Figure 3 is a schematic cross-sectional view of the buffer cylinder in the present invention; Figure 4 is in the present invention Figure 3 is a schematic diagram of the front view structure; Figure 5 is a schematic partial cross-sectional view of the cryogenic tank body in the present invention; Figure 6 is a schematic diagram of the cooperation between the round rod and the buffer cylinder in the present invention.

[0015] In the figure: 1. Cryogenic tank body; 101. Inner tank; 102. Outer tank; 2. Buffer cylinder; 201. First chamber; 202. Second chamber; 203. Fixed block; 204. Bump; 3. Main delivery pipe; 4. Pressure relief sampling pipe; 5. Detection assembly; 6. Collection tank; 7. Processing assembly; 8. Liquid storage tank; 9. Valve plate; 10. Semi-floating ball; 11. Spring; 12. Round rod; 13. Movable plate; 14. Threaded rod; 15. Driving ring; 16. Extension platform; 17. First flange connection assembly; 18. Second flange connection assembly; 19. Expanded perlite; 20. Pressure sensor; 21. Glass fiber cloth; 22. Elastic felt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] Please refer to Figures 1 - 6 As shown, the present invention is a sampling detection device for a cryogenic tank, which includes a cryogenic tank body 1 and a liquid storage tank 8. The feeding end of the cryogenic tank body 1 is communicated with the discharging end of the liquid storage tank 8 through a pipeline. The discharging end of the cryogenic tank body 1 is sequentially connected with a buffer cylinder 2 and a circulation assembly, and the circulation assembly is communicated with the liquid storage tank 8. The cryogenic tank body 1 includes an inner tank 101 and an outer tank 102. The outer tank 102 is sleeved outside the inner tank 101, and a monitoring assembly for monitoring the inner tank 101 is arranged between the inner tank 101 and the outer tank 102; A first chamber 201 and a second chamber 202 are formed in the buffer cylinder 2. The bottom ends of the first chamber 201 and the second chamber 202 are communicated. The first chamber 201 is communicated with the cryogenic tank body 1. The bottom of the buffer cylinder 2 is communicated with the circulation assembly through a main delivery pipe 3. The side wall of the buffer cylinder 2 is communicated with the circulation assembly through a pressure relief sampling pipe 4, and a detection assembly 5 is arranged on the pressure relief sampling pipe 4. The detection assembly 5 is used to detect the water flowing in the pressure relief sampling pipe 4. Both the main delivery pipe 3 and the pressure relief sampling pipe 4 are communicated with the second chamber 202, and the connection between the main delivery pipe 3 and the second chamber 202 is always open. The diameter of the pressure relief sampling pipe 4 is smaller than that of the main delivery pipe 3; A valve plate 9 is slidably installed in the second chamber 202. A semi-floating ball 10 is fixedly installed at the bottom of the valve plate 9. The buoyancy force received by the semi-floating ball 10 drives the valve plate 9 to rise. An elastic assembly is arranged in the second chamber 202. The elastic assembly is connected with the valve plate 9, and the elastic force of the elastic assembly causes the valve plate 9 to descend. When the buoyancy force is less than the elastic force, the valve plate 9 descends and blocks the connection between the pressure relief sampling pipe 4 and the second chamber 202. When the buoyancy force is greater than the elastic force, the valve plate 9 rises and opens the connection between the pressure relief sampling pipe 4 and the second chamber 202.

[0018] Specifically, round rods 12 are fixedly connected to the four corners of the top of the valve plate 9, and the round rods 12 are slidably connected with the top of the buffer cylinder 2.

[0019] Working principle of the present invention: First, at the start of the test, the water in the liquid storage tank 8 is filled into the cryogenic tank body 1. This operation aims to create a high-pressure environment inside the cryogenic tank body 1. Under the action of high pressure, the inner tank body 101 will deform. At the same time, the monitoring component will accurately record the deformation pressure data of the inner tank body 101. This step is crucial because the deformation pressure of the inner tank body 101 can reflect the structural response of the cryogenic tank body 1 under high pressure, providing a key basis for subsequent evaluation of the performance of the cryogenic tank body 1. Subsequently, the water in the cryogenic tank body 1 is quickly discharged into the buffer cylinder 2. During this process, the monitoring component records the deformation pressure of the inner tank body 101 again. As the water flows from the cryogenic tank body 1 into the buffer cylinder 2, the water gradually fills the first chamber 201 and the second chamber 202 and flows through the main delivery pipe 3 to the circulation component. The main delivery pipe 3, as the main flow channel, undertakes the important task of transporting most of the water to the circulation component. However, when the cryogenic tank body 1 is in a high-pressure state, the strong pressure will accelerate the flow rate of the water into the buffer cylinder 2. During this process, although the main delivery pipe 3 is the main drainage channel, due to the too-fast water flow rate, the main delivery pipe 3 cannot instantly drain all the water in time. At this time, the buoyancy of the water plays a key role. It will make the semi-floating ball 10 hold the valve plate 9 and slowly rise. When the valve plate 9 rises to a certain position, it will open the connection between the pressure relief sampling pipe 4 and the second chamber 202. Then a small part of the water will flow from the pressure relief sampling pipe 4 to the circulation component. The water flowing through the pressure relief sampling pipe 4 will be specifically detected by the detection component 5. The purpose is to judge whether impurities that can indicate the unqualified cryogenic tank body 1 are generated in the water. The design here is very ingenious. The diameter of the pressure relief sampling pipe 4 is smaller than that of the main delivery pipe 3. The smaller diameter makes the water flow through the pressure relief sampling pipe 4 more concentrated, and the impurities in the water are also more concentrated. This highly concentrated impurity distribution state enables the detection component 5 to more efficiently capture the existing unqualified impurities during detection. Compared with directly detecting in the main delivery pipe 3, this design greatly improves the detection efficiency and can more accurately and quickly judge whether there are problems with the cryogenic tank body 1, providing strong support for ensuring product quality. At the same time, the water flowing through the pressure relief sampling pipe 4 also plays a role in relieving pressure, allowing the high pressure inside the cryogenic tank body 1 to be reasonably released.

[0020] Such as Figures 1 - 6As shown, as a preferred embodiment of the present invention, the elastic component includes a spring 11, a movable plate 13 and an adjusting component. The movable plate 13 is slidably installed in the second chamber 202 and is close to the top plate of the second chamber 202. The movable plate 13 is driven by the adjusting component to move up and down. The movable plate 13 is connected to the valve plate 9 through the spring 11. The pre-tightening force of the spring 11 causes the valve plate 9 to descend. A bump 204 is fixedly installed in the second chamber 202, and the bump 204 abuts against the valve plate 9. When the valve plate 9 abuts against the bump 204, the valve plate 9 blocks the connection between the pressure relief sampling pipe 4 and the second chamber 202.

[0021] In actual application of this embodiment, the pre-tightening force of the spring 11 causes the valve plate 9 to descend, so as to abut against the bump 204. At this time, water can only flow through the main delivery pipe 3. As the water volume increases, the buoyancy of the water will cause the semi-floating ball 10 to push the valve plate 9 upward, thereby compressing the spring 11, and then opening the channel of the pressure relief sampling pipe 4, allowing water to flow through the pressure relief sampling pipe 4, achieving the purpose of pressure relief and obtaining a water sample for detection. The adjusting component can control the lifting of the movable plate 13. When the movable plate 13 descends, the movable plate 13 will compress the spring 11, thereby increasing the pre-tightening force of the spring 11 on the valve plate 9. At this time, a greater buoyancy or water pressure is required to make the semi-floating ball 10 drive the valve plate 9 to rise. That is to say, it is possible to adjust at what water pressure and buoyancy the channel of the pressure relief sampling pipe 4 will open, so as to control the opening time and the duration of the pressure relief sampling pipe 4. At the same time, according to actual needs, the water pressure and buoyancy required for the opening of the channel of the pressure relief sampling pipe 4 can be flexibly adjusted. For example, in different test scenarios or for the detection of different types of liquids, the opening conditions of the channel of the pressure relief sampling pipe 4 can be accurately set according to specific requirements, improving the versatility and adaptability of the system.

[0022] As Figures 1 - 6 As shown, as a preferred embodiment of the present invention, the adjusting component includes a threaded rod 14, a driving ring 15, an extension platform 16 and a fixing block 203. The fixing block 203 is fixedly installed in the second chamber 202 and is slidably connected to the movable plate 13. The extension platform 16 is fixedly installed on the top of the buffer cylinder 2. The threaded rod 14 is slidably installed on the extension platform 16, and one end of the threaded rod 14 extends into the second chamber 202 and is fixedly connected to the movable plate 13 at this end. The driving ring 15 is rotatably installed on the extension platform 16, and the driving ring 15 is threadedly connected to the threaded rod 14.

[0023] In actual application of this embodiment, first, the movable plate 13 is restricted by the fixed block 203 to slide only up and down without rotation. Then, the driving ring 15 is manually rotated. Since the driving ring 15 is threadedly connected to the threaded rod 14, the rotation of the driving ring 15 can drive the threaded rod 14 to move up and down, thereby changing the pre-tightening force of the spring 11. This manual adjustment method is simple and intuitive, reducing the maintenance cost and operation difficulty of the system.

[0024] As Figures 1 - 5 shown, as a preferred embodiment of the present invention, there is a gap between the outer tank body 102 and the inner tank body 101. The monitoring component includes a fiberglass cloth 21, an elastic felt 22, and a pressure sensor 20. The fiberglass cloth 21 is inserted into the gap. The elastic felt 22 is filled between the fiberglass cloth 21 and the inner tank body 101. The expanded perlite 19 is filled between the fiberglass cloth 21 and the outer tank body 102. A plurality of pressure sensors 20 are arranged at equal intervals in the expanded perlite 19, and the pressure sensors 20 are in contact with the fiberglass cloth 21. The fiberglass cloth 21 is connected to the detection component 5.

[0025] In actual application of this embodiment, first, the fiberglass cloth 21 is wound into a ring shape and then inserted into the gap between the inner tank body 101 and the outer tank body 102. Subsequently, the expanded perlite 19 is poured between the fiberglass cloth 21 and the outer tank body 102, and several pressure sensors 20 are arranged at equal intervals in the expanded perlite 19 and the pressure sensors 20 are in contact with the fiberglass cloth 21. Then, the elastic felt 22 is formed into a ring shape and inserted between the fiberglass cloth 21 and the inner tank body 101. Before testing the filling and discharging of water from the cryogenic tank body 1, the initial thickness of the expanded perlite 19 is recorded. Then, after filling water into the cryogenic tank body 1, due to the high pressure, the inner tank body 101 is compressed, causing the elastic felt 22 and the fiberglass cloth 21 to deform and compress the pressure sensors 20 and the expanded perlite 19. At this time, the pressure sensor 20 records the data change of the pressure during the test process. According to the recorded data of the detection component 5, it is possible to judge the specific pressure value inside the cryogenic tank body 1 when the inner tank body 101 is deformed and damaged during the filling and discharging of water, and it is possible to judge which places are prone to damage according to the places where the pressure sensors 20 are arranged.

[0026] As Figures 1 - 4 shown, as a preferred embodiment of the present invention, the bottom plate of the buffer cylinder 2 is inclined, and the connection between the main conveying pipe 3 and the buffer cylinder 2 is at the lowest horizontal height.

[0027] In actual application of this embodiment, since the bottom plate of the buffer cylinder 2 is inclined, after water enters the buffer cylinder 2, it will flow along the inclined direction of the bottom plate of the buffer cylinder 2. And the connection between the main delivery pipe 3 and the buffer cylinder 2 is at the lowest horizontal height, so as to ensure that the water in the buffer cylinder 2 is automatically drained completely, avoiding water remaining in the buffer cylinder 2.

[0028] As Figure 1 shown, as a preferred embodiment of the present invention, the circulation assembly includes a collection tank 6 and a processing assembly 7. The main delivery pipe 3 and the detection assembly 5 are both connected to the collection tank 6. The collection tank 6 is connected to the processing assembly 7. The processing assembly 7 is connected to the feeding end of the liquid storage tank 8 through a pipeline, and the collection tank 6 is located below the cryogenic tank body 1.

[0029] In actual application of this embodiment, the water discharged from the main delivery pipe 3 and the pressure relief sampling pipe 4 will enter the collection tank 6, thus realizing the function of convergence. Then it is uniformly transported to the processing assembly 7 through the collection tank 6. The processing assembly 7 performs operations such as deoxidation, filtration, and purification on the water that has undergone testing to ensure that the treated water is similar to the initial water quality, thereby ensuring the consistency of water quality during the testing process and further guaranteeing the accuracy of the test results.

[0030] As Figure 2 shown, as a preferred embodiment of the present invention, the feeding end and the discharging end of the detection assembly 5 are respectively installed on the pressure relief sampling pipe 4 through a first flange connection assembly 17 and a second flange connection assembly 18.

[0031] In actual application of this embodiment, the detection assembly 5 is installed on the pressure relief sampling pipe 4 through the first flange connection assembly 17 and the second flange connection assembly 18, which can relatively conveniently realize the disassembly and installation of the detection assembly 5. It should be noted that after ensuring that the valve plate 9 seals the connection between the pressure relief sampling pipe 4 and the second chamber 202, the disassembly and installation operations are carried out.

[0032] Please refer to Figures 1 - 6 shown. The present invention is a sampling method for a sampling and detection device for a cryogenic tank. The method is applied to a sampling and detection device for a cryogenic tank as described in the above embodiment. The method includes the following steps: Step S1: First, test the cryogenic tank body 1. Fill the water in the liquid storage tank 8 into the cryogenic tank body 1 to make the cryogenic tank body 1 form a high pressure. The high pressure causes the inner tank body 101 to deform, and at the same time, the monitoring assembly records the deformation of the inner tank body 101. Step S2: Subsequently, quickly drain the water in the cryogenic tank body 1 into the buffer cylinder 2. The water will fill the first chamber 201 and the second chamber 202 and flow from the main delivery pipe 3 into the circulation assembly. Step S3: The high pressure inside the low-temperature tank body 1 will accelerate the flow of water into the buffer cylinder 2, and the main delivery pipe 3 cannot discharge the water in time. At this time, the buoyancy of the water will cause the semi-floating ball 10 to hold up the valve plate 9 and rise. The valve plate 9 rises and opens the connection between the pressure relief sampling pipe 4 and the second chamber 202; Step S4: A small part of the water will flow from the pressure relief sampling pipe 4 to the circulation component, and the water flowing through the pressure relief sampling pipe 4 will be detected by the detection component 5 to detect whether impurities that can determine the unqualified low-temperature tank body 1 are generated in the water; Step S5: The circulation component re-delivers the water to the liquid storage tank 8, and the test of filling and discharging the low-temperature tank body 1 can be repeated.

[0033] The above has described an embodiment of the present invention in detail, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the present invention application shall still fall within the scope covered by the patent of the present invention.

Claims

1. A sampling and detection device for a low-temperature tank, characterized in that: It includes a cryogenic tank body (1) and a liquid storage tank (8). The feeding end of the cryogenic tank body (1) is communicated with the discharging end of the liquid storage tank (8) through a pipeline. The discharging end of the cryogenic tank body (1) is sequentially connected with a buffer cylinder (2) and a circulation component. The circulation component is communicated with the liquid storage tank (8). The cryogenic tank body (1) includes an inner tank body (101) and an outer tank body (102). The outer tank body (102) is sleeved outside the inner tank body (101). A monitoring component for monitoring the inner tank body (101) is arranged between the inner tank body (101) and the outer tank body (102). A first chamber (201) and a second chamber (202) are formed in the buffer cylinder (2). The bottom ends of the first chamber (201) and the second chamber (202) are communicated. The first chamber (201) is communicated with the cryogenic tank body (1). The bottom of the buffer cylinder (2) is communicated with the circulation component through a main conveying pipe (3). The side wall of the buffer cylinder (2) is communicated with the circulation component through a pressure relief sampling pipe (4). A detection component (5) is arranged on the pressure relief sampling pipe (4). The detection component (5) is used for detecting the water flowing in the pressure relief sampling pipe (4). Both the main conveying pipe (3) and the pressure relief sampling pipe (4) are communicated with the second chamber (202). The connection between the main conveying pipe (3) and the second chamber (202) is always open. The diameter of the pressure relief sampling pipe (4) is smaller than that of the main conveying pipe (3). A valve plate (9) is slidably installed in the second chamber (202). A semi-floating ball (10) is fixedly installed at the bottom of the valve plate (9). The buoyancy received by the semi-floating ball (10) drives the valve plate (9) to rise. An elastic component is arranged in the second chamber (202). The elastic component is connected with the valve plate (9). The elastic force of the elastic component causes the valve plate (9) to descend. When the buoyancy is less than the elastic force, the valve plate (9) descends and blocks the connection between the pressure relief sampling pipe (4) and the second chamber (202). When the buoyancy is greater than the elastic force, the valve plate (9) rises and opens the connection between the pressure relief sampling pipe (4) and the second chamber (202).

2. The sampling and detection device for a cryogenic tank according to claim 1, wherein, The elastic component includes a spring (11), a movable plate (13) and an adjusting component. The movable plate (13) is slidably installed in the second chamber (202), and the movable plate (13) is close to the top plate of the second chamber (202). The movable plate (13) is driven by the adjusting component to rise and fall. The movable plate (13) is connected with the valve plate (9) through the spring (11). The pre-tightening force of the spring (11) causes the valve plate (9) to descend. A convex block (204) is fixedly installed in the second chamber (202). The convex block (204) abuts against the valve plate (9). When the valve plate (9) abuts against the convex block (204), the valve plate (9) blocks the connection between the pressure relief sampling pipe (4) and the second chamber (202).

3. The sampling and detection device for a cryogenic tank according to claim 2, wherein, The adjusting component includes a threaded rod (14), a driving ring (15), an extension platform (16) and a fixing block (203). The fixing block (203) is fixedly installed in the second chamber (202) and is slidably connected to the movable plate (13). The extension platform (16) is fixedly installed at the top of the buffer cylinder (2). The threaded rod (14) is slidably installed on the extension platform (16), and one end of the threaded rod (14) extends into the second chamber (202) and is fixedly connected to the movable plate (13). The driving ring (15) is rotatably installed on the extension platform (16) and is threadedly connected to the threaded rod (14).

4. The sampling and detection device for a low-temperature tank according to claim 1, characterized in that, There is a gap between the outer tank body (102) and the inner tank body (101). The monitoring component includes a fiberglass cloth (21), an elastic felt (22) and a pressure sensor (20). The fiberglass cloth (21) is inserted into the gap. The elastic felt (22) is filled between the fiberglass cloth (21) and the inner tank body (101). The expanded perlite (19) is filled between the fiberglass cloth (21) and the outer tank body (102). A plurality of pressure sensors (20) are arranged at equal intervals in the expanded perlite (19), and the pressure sensors (20) are attached to the fiberglass cloth (21). The fiberglass cloth (21) is connected to the detection component (5).

5. The sampling and detection device for a cryogenic tank according to claim 1, characterized in that, The bottom plate of the buffer cylinder (2) is arranged obliquely, and the connection between the main delivery pipe (3) and the buffer cylinder (2) is at the lowest horizontal height point.

6. The sampling and detection device for a cryogenic tank according to claim 1, characterized in that, The circulation component includes a collecting tank (6) and a processing component (7). The main delivery pipe (3) and the detection component (5) are both communicated with the collecting tank (6). The collecting tank (6) is communicated with the processing component (7). The processing component (7) is communicated with the feeding end of the liquid storage tank (8) through a pipeline, and the collecting tank (6) is located below the cryogenic tank body (1).

7. The sampling and detection device for a cryogenic tank according to claim 1, characterized in that, The feeding end and the discharging end of the detection component (5) are respectively installed on the pressure relief sampling pipe (4) through a first flange connection component (17) and a second flange connection component (18).

8. Sampling method of a sampling and detection device for a low-temperature tank, characterized in that, The method is applied to a sampling and detection device for a cryogenic tank as described in any one of claims 1-7. The method includes the following steps: Step S1: First, test the cryogenic tank body (1). Fill the water in the liquid storage tank (8) into the cryogenic tank body (1) to form a high pressure in the cryogenic tank body (1). The high pressure causes the inner tank body (101) to deform, and at the same time, the monitoring component records the deformation of the inner tank body (101). Step S2: Subsequently, quickly drain the water in the cryogenic tank body (1) into the buffer cylinder (2). The water will fill the first chamber (201) and the second chamber (202) and flow into the circulation component from the main delivery pipe (3). Step S3: The high pressure in the cryogenic tank body (1) will accelerate the flow of water into the buffer cylinder (2). The main delivery pipe (3) cannot drain the water in time. At this time, the buoyancy of the water will cause the semi-floating ball (10) to hold the valve plate (9) up. The valve plate (9) rises and opens the connection between the pressure relief sampling pipe (4) and the second chamber (202). Step S4: A small portion of the water will flow from the pressure relief sampling pipe (4) into the circulation assembly, and the water flowing through the pressure relief sampling pipe (4) will be detected by the detection assembly (5) to detect whether impurities that can determine the unqualified of the cryogenic tank body (1) are generated in the water; Step S5: The circulation assembly re-transports the water into the liquid storage tank (8), and then the test of filling and discharging the cryogenic tank body (1) can be repeated.

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