A device and method for detecting the vacuum degree of a liquid hydrogen double-walled spherical tank

Abstract

This invention relates to the field of spherical tank inspection technology, and discloses a vacuum degree detection device and method for a liquid hydrogen double-walled spherical tank. The vacuum degree detection device includes: a double-walled spherical tank body, with an internal measurement and positioning mechanism disposed in the interlayer of the double-walled spherical tank body; the internal measurement and positioning mechanism includes an inner ring tube, several weld-side arms, and a vacuum degree detection component. The inner ring tube is fixed in the top interlayer of the double-walled spherical tank body, and several weld-side arms are fixedly connected to and communicate with the inner ring tube below it along the longitudinal weld seam extension direction; each weld-side arm is arrayed with sensor elements, and a leak detection pendulum is suspended below each sensor element by a pull-ball hanging rope; by setting an internal measurement and positioning mechanism in the interlayer of the double-walled spherical tank and arraying leak detection pendulums and sensor elements on the weld-side arms, this invention can utilize the weak airflow disturbance generated at the leak point to trigger the pendulum to swing, thereby allowing the sensor elements to accurately capture and locate the leak point.

Description

Technical Field

[0001] This invention relates to the field of spherical tank testing, and more specifically, to a device and method for testing the vacuum level of a liquid hydrogen double-walled spherical tank. Background Technology

[0002] As a clean energy source, liquid hydrogen is usually stored and transported in double-walled spherical tanks for insulation. The interlayer needs to be kept in a high vacuum state to reduce heat transfer and ensure the ultra-low temperature storage of liquid hydrogen. However, during long-term use, the interlayer of the double-walled spherical tank may experience minor leaks due to material fatigue, weld defects or external impacts, which can lead to a decrease in vacuum.

[0003] In existing technologies, the vacuum level of a double-walled spherical tank is typically monitored using a vacuum gauge. While this method can determine if the vacuum level is abnormal, it cannot accurately pinpoint the location of leaks. When a decrease in vacuum is detected, maintenance personnel need to spend a significant amount of time and effort troubleshooting, and may even need to conduct a large-scale inspection of the entire tank. This is not only inefficient but also costly. Therefore, we propose a vacuum level detection device and method for liquid hydrogen double-walled spherical tanks. Summary of the Invention

[0004] This invention provides a vacuum degree detection device and method for a liquid hydrogen double-walled spherical tank, solving the technical problem in related technologies where maintenance personnel need to spend a lot of time and effort to troubleshoot when a decrease in vacuum degree is detected, and may even need to conduct large-scale testing of the entire spherical tank.

[0005] The first aspect of the present invention provides a vacuum degree detection device for a liquid hydrogen double-walled spherical tank, comprising: a double-walled spherical tank body, wherein an internal measurement and positioning mechanism is provided in the interlayer of the double-walled spherical tank body;

[0006] The internal measurement and positioning mechanism includes an inner ring tube, several seam-following arms, and a vacuum degree detection component. The inner ring tube is fixed in the top interlayer of the double-layer spherical tank, and several seam-following arms are fixedly connected to the inner ring tube below and communicate with it along the longitudinal weld seam extension direction.

[0007] Each of the seam arms is equipped with an array of sensor elements, and each sensor element is suspended by a ball-pulling rope to measure the air deflating pendulum.

[0008] The vacuum detection component includes a smart terminal and a vacuum detector, and all sensors are connected to the smart terminal for signal transmission.

[0009] When airflow disturbance occurs at the venting point in the double-layer spherical tank, the corresponding venting pendulum swings under the impact of the airflow, triggering the corresponding sensor to collect data and transmit it to the intelligent terminal to accurately locate the venting point. The intelligent terminal then performs a dual data comparison with the actual vacuum value measured by the vacuum detector to avoid false alarms.

[0010] Furthermore, the vacuum degree detection component also includes a central control cabinet, which has two independent spaces: a central control room and a pump room. The intelligent terminal is located in the central control room, and the pump room is equipped with a vacuum suction pump and a vacuum detector. The intelligent terminal is connected to the vacuum suction pump and the vacuum detector respectively.

[0011] Furthermore, the back of the main control cabinet is equipped with a conduit and a suction pipe. The ends of the conduit and the suction pipe furthest from the main control cabinet are fixedly connected to an outer ring pipe, which is located on the top periphery of the double-layer spherical tank. Several through-wall pipes are fixedly connected to the inner side of the outer ring pipe, and a pipe plug is fixedly installed inside the through-wall pipe.

[0012] Furthermore, the inside of the plug head is provided with three holes, namely a pipe passage hole, a wire passage hole, and a suction port. A branch pipe is inserted through the pipe passage hole. One end of the branch pipe is fixedly connected to the inner ring pipe in the double-layer spherical tank and they are interconnected. The other end of the branch pipe enters the wire passage pipe through the wall-penetrating pipe and the outer ring pipe in sequence. Several skirt-shaped anti-reverse ring plates are provided on the inner wall of the pipe passage hole.

[0013] Furthermore, a probe wire is threaded through the wire hole, and a pressure probe is installed at one end of the probe wire, which is located in the interlayer of the double-layer spherical tank. Several skirt-shaped anti-reflection ring plates are installed on the inner wall of the wire hole. The end of the probe wire away from the pressure probe enters the wire pipe through the wall pipe and the outer ring pipe in sequence, and finally enters the pump chamber and connects with the vacuum testing machine.

[0014] Furthermore, a solenoid valve is fixedly installed inside the suction port, and the solenoid valve is connected to and controlled by the smart terminal.

[0015] Furthermore, there are several air vents arranged in an equidistant array inside the seam arm, and the sensor is fixed on the top of the air vent. The air vents in the same seam arm are interconnected through the wire channel.

[0016] Furthermore, the outer wall of the venting pendulum is provided with several arc-shaped air guide grooves and several thin springs, none of which are in contact with the inner wall of the vent window.

[0017] Furthermore, sensor wires are fixedly installed at the connection endpoints of the sensor components. All sensor wires are routed close to the inner wall of the ventilation window and enter the inner ring pipe along the wire path before connecting to the smart terminal.

[0018] A second aspect of the present invention provides a method for detecting the vacuum level of a liquid hydrogen double-walled spherical tank, comprising the following steps:

[0019] S1. Start the vacuum pump and solenoid valve to extract the air from the interlayer of the double-layer spherical tank through the suction port. The vacuum detector collects the interlayer vacuum data in real time through the pressure probe and transmits it to the smart terminal.

[0020] S2. When the interlayer vacuum level reaches the preset value, the intelligent terminal controls the vacuum pump to stop working and closes the solenoid valve to maintain the interlayer vacuum state.

[0021] S3. The intelligent terminal continuously receives vacuum monitoring data from the vacuum detector. If an abnormal change in vacuum level is detected, the alarm system is triggered.

[0022] S4. Airflow disturbance near the leak point triggers the corresponding leak detection pendulum to swing. The sensor collects vibration signals and locates the leak location. The intelligent terminal combines vacuum data and sensor signals for dual verification.

[0023] S5. After confirming the leak, the intelligent terminal controls the vacuum pump to restart to maintain the vacuum level of the interlayer, and simultaneously sends the location information of the leak point to the maintenance personnel.

[0024] The beneficial effects of this invention are as follows:

[0025] This invention solves the problem that traditional methods cannot accurately locate leak points by setting an internal measuring and positioning mechanism in the interlayer of a double-layer spherical tank and arranging a leak-detecting pendulum ball and sensor on the seam arm. It can use the weak airflow disturbance generated at the leak point to trigger the pendulum ball to swing, and then the sensor can accurately capture and locate the leak point.

[0026] The intelligent terminal unit combines the vibration signal from the venting pendulum with the measured vacuum value from the vacuum detector for dual data comparison, effectively avoiding false alarms that may be caused by a single data source, and significantly improving the accuracy and reliability of the detection. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure along the seam arm of the present invention;

[0029] Figure 3 This is a schematic diagram of the inner ring tube structure of the present invention;

[0030] Figure 4 This is the invention Figure 3 Enlarged view of point A in the middle;

[0031] Figure 5 This is a schematic diagram of the ventilation window structure of the present invention;

[0032] Figure 6 This is a schematic diagram of the main control cabinet structure of the present invention;

[0033] Figure 7 This is a schematic diagram of the through-wall pipe structure of the present invention;

[0034] Figure 8 This is a schematic diagram of the plug head structure of the present invention.

[0035] In the diagram: 11. Double-layer spherical tank; 2. Internal positioning mechanism; 21. Outer ring pipe; 22. Through-wall pipe; 23. Inner ring pipe; 24. Along-slit arm; 25. Branch pipe; 26. Air leakage measuring pendulum; 27. Air passage window; 28. Sensor component; 29. ​​Pulling ball hanging rope; 201. Cable guide; 202. Sensor wire; 203. Thin spring component; 204. Air guide strip groove; 31. Main control cabinet; 32. Cable guide; 33. Suction pipe; 34. Probe wire; 35. Pressure measuring probe; 36. Main control room; 37. Intelligent terminal; 38. Pump room; 39. Vacuum suction pump; 301. Vacuum detector; 41. Pipe plug; 42. Pipe hole; 43. Anti-reverse ring plate one; 44. Cable hole; 45. Anti-reverse ring plate two; 46. Suction port; 47. Solenoid valve. Detailed Implementation

[0036] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0037] Example 1

[0038] like Figure 1 - Figure 8 As shown, a vacuum degree detection device for a liquid hydrogen double-walled spherical tank includes: a double-walled spherical tank 11, and an internal measurement and positioning mechanism 2 is provided in the interlayer of the double-walled spherical tank 11;

[0039] The internal measurement and positioning mechanism 2 includes an inner ring tube 23, several seam-following arms 24 and a vacuum degree detection component. The inner ring tube 23 is fixed in the top interlayer of the double-layer spherical tank 11, and several seam-following arms 24 are fixedly connected to the inner ring tube 23 below and communicate with it along the longitudinal weld seam extension direction.

[0040] Each of the seam arms 24 is equipped with an array of sensor elements 28, and each sensor element 28 is suspended by a ball-pulling rope 29 to detect the air leakage pendulum 26.

[0041] The vacuum detection component includes a smart terminal 37 and a vacuum detector 301, and all sensor components 28 are connected to the smart terminal 37 via signal connection.

[0042] When airflow disturbance occurs at the venting point in the double-layer spherical tank 11, the corresponding venting pendulum 26 swings under the impact of the airflow, triggering the corresponding sensor 28 to collect data and transmit it to the intelligent terminal 37 to accurately locate the venting point. The intelligent terminal 37 performs a dual data comparison with the measured vacuum value of the vacuum detector 301 to avoid false alarms.

[0043] The vacuum degree detection component also includes a central control cabinet 31. The central control cabinet 31 has two independent spaces: a central control room 36 and a pump room 38. The intelligent terminal 37 is located in the central control room 36. The pump room 38 is fixedly installed with a vacuum suction pump 39 and a vacuum detector 301. The intelligent terminal 37 is connected to the vacuum suction pump 39 and the vacuum detector 301 via signals.

[0044] The back of the main control cabinet 31 is provided with a conduit 32 and a suction pipe 33. The ends of the conduit 32 and the suction pipe 33 away from the main control cabinet 31 are fixedly connected to an outer ring pipe 21. The outer ring pipe 21 is located on the top periphery of the double-layer spherical tank 11. Several through-wall pipes 22 are fixedly connected to the inner side of the outer ring pipe 21. A pipe plug 41 is fixedly installed inside the through-wall pipe 22.

[0045] The pipe plug 41 has three holes inside: a pipe hole 42, a wire hole 44, and a suction port 46. A branch pipe 25 is inserted through the pipe hole 42. One end of the branch pipe 25 is fixedly connected to the inner ring pipe 23 in the interlayer of the double-layer spherical tank 11 and they are interconnected. The other end of the branch pipe 25 enters the wire hole 32 through the wall-penetrating pipe 22 and the outer ring pipe 21 in sequence. Several skirt-shaped anti-reverse ring plates 43 are provided on the inner wall of the pipe hole 42.

[0046] A probe wire 34 is inserted inside the wire hole 44. A pressure probe 35 is installed at one end of the probe wire 34, which is located in the interlayer of the double-layer spherical tank 11. Several skirt-shaped anti-reflection ring plates 45 are installed on the inner wall of the wire hole 44. The end of the probe wire 34 away from the pressure probe 35 enters the wire pipe 32 through the wall-penetrating pipe 22 and the outer ring pipe 21 in sequence, and finally enters the pump chamber 38 and connects with the vacuum detector 301.

[0047] A solenoid valve 47 is fixedly installed inside the suction port 46, and the solenoid valve 47 is connected to and controlled by the smart terminal 37.

[0048] The inner equidistant array of the seam arm 24 has several air windows 27, and the sensor element 28 is fixed on the top of the air window 27. The air windows 27 in the same seam arm 24 are interconnected through the wire channel 201.

[0049] The outer wall of the venting pendulum 26 is provided with several arc-shaped air guide grooves 204 and several thin springs 203, and the thin springs 203 do not contact the inner wall of the vent window 27.

[0050] Sensor wires 202 are fixedly installed at the connection end of sensor component 28. All sensor wires 202 are closely attached to the inner wall of the ventilation window 27 and enter the inner ring pipe 23 along the wire passage 201 before connecting to the smart terminal 37.

[0051] In use, the intelligent terminal 37 first controls the vacuum pump 39 and the solenoid valve 47 to work simultaneously. As the vacuum pump 39 works, the air in the interlayer of the double-walled spherical tank 11 is gradually extracted along the suction port 46, the wall-penetrating pipe 22, and the suction pipe 33. At the same time, the vacuum detector 301 detects data through multiple pressure probes 35 located in the interlayer of the double-walled spherical tank 11 and transmits it to the intelligent terminal 37. When the air pressure in the interlayer of the double-walled spherical tank 11 reaches the specified value, the intelligent terminal 37 controls the vacuum pump 39 to stop working and controls the solenoid valve 47 to block the suction port 46 to prevent leakage.

[0052] Afterwards, the intelligent terminal 37 continuously or periodically controls the vacuum detector 301 to work according to the preset program, and transmits the data to the intelligent terminal 37 in real time. If a change occurs in the vacuum level data, an alarm will be issued to remind the staff to carry out maintenance.

[0053] When the vacuum pump 39 extracts air from the interlayer of the double-layer spherical tank 11, as the interlayer of the double-layer spherical tank 11 gradually becomes vacuumed, the flexible anti-reflection ring 43 and anti-reflection ring 45 adaptively fit more closely with the branch pipe 25 and the probe line 34 under pressure, thus achieving multiple sealing effects.

[0054] The sensor wires 202 of all sensor components 28 are finally divided and converged in the distribution pipe 25. The distribution pipe 25 has a connector, and after the connector is connected to the sensor wire 202, the distribution pipe 25 is still in a sealed state and will not cause leakage. Finally, the signal is transmitted to the smart terminal 37.

[0055] When the vacuum level in the interlayer of the double-walled spherical tank 11 is maintained at a specified value, the airflow in the interlayer remains stable without any disturbance. All the leak-measuring pendulums 26 remain stable under gravity. If a leak occurs in the interlayer of the double-walled spherical tank 11, air will enter the interlayer of the double-walled spherical tank 11 from the leak point under the strong suction of the vacuum. At this time, the airflow near the leak point will be disturbed first. As the airflow near the leak point is disturbed, it will cause the leak-measuring pendulum 26 closest to the leak point to swing or shake. The shaking of the leak-measuring pendulum 26 will be sensed by the corresponding sensor 28, and the data will be transmitted to the intelligent terminal 37 immediately. The display screen of the intelligent terminal 37 will show the location map corresponding to the sensor 28. At this time, the staff can find the leak point in a timely and accurate manner.

[0056] When the venting pendulum 26 swings, the pressure probe 35 of the vacuum detector 301 will also detect the change in vacuum level data in the interlayer of the double-layer spherical tank 11. The intelligent terminal 37 performs comprehensive processing on the vacuum level data in the interlayer of the double-layer spherical tank 11 and the data from the sensor 28 to determine whether a leak has occurred. Under the dual action, false alarms are prevented.

[0057] When the intelligent terminal 37 determines that a real leak has occurred, it promptly issues an alarm and controls the vacuum pump 39 to work, continuously extracting air from the interlayer of the double-walled spherical tank 11, ensuring that the vacuum level is always within an acceptable range before maintenance.

[0058] All the seam arms 24 follow the weld seam because the weld seam of the double-walled spherical tank 11 is the most prone to leakage.

[0059] The design of the air guide groove 204 can increase the force on the gas venting pendulum 26 under gas disturbance, while the thin spring 203 increases the vibration sensitivity of the gas venting pendulum 26. Even when the gas venting pendulum 26 is not shaking, a small airflow disturbance can drive the vibration of the thin spring 203.

[0060] The internal measurement and positioning mechanism 2 is arranged along the longitudinal weld seam with weld arm 24, which can accurately detect the weld seam area of ​​the double-layer spherical tank 11 that is most prone to leakage, thereby improving the leakage location efficiency.

[0061] The air leakage detection pendulum 26 is suspended by the ball-pulling rope 29, and combined with the air guide groove 204 to enhance the airflow force and the thin spring 203 to improve vibration sensitivity, so as to achieve rapid response to minor leaks.

[0062] The vacuum detection component adopts a dual data comparison mechanism of intelligent terminal 37 and vacuum detector 301 to avoid false alarms caused by a single data source and improve detection accuracy;

[0063] The inner plug head 41 of the through-wall tube 22 adopts a skirt-shaped anti-reverse ring plate 1 43 and anti-reverse ring plate 2 45 to adaptively fit the branch tube 25 and the probe line 34, forming multiple dynamic seals to prevent vacuum leakage.

[0064] The air vent 27 inside the seam arm 24 is connected through the wiring channel 201, and the sensor wire 202 runs along the inner wall and converges at the branch pipe 25 to ensure the sealing of the line and the stability of signal transmission.

[0065] The main control cabinet 31 is divided into a main control room 36 and a pump room 38, which enables the independent operation and coordinated control of the intelligent terminal 37, the vacuum suction pump 39 and the vacuum detector 301, ensuring system reliability;

[0066] The solenoid valve 47 is precisely controlled by the intelligent terminal 37. After the vacuuming is completed, it blocks the suction port 46 to prevent external air from flowing back in and maintain the stability of the interlayer vacuum.

[0067] Example 2

[0068] A method for detecting the vacuum level of a liquid hydrogen double-walled spherical tank includes the following steps:

[0069] S1. Start the vacuum pump 39 and solenoid valve 47 to extract the air in the interlayer of the double-layer spherical tank 11 through the suction port 46. The vacuum detector 301 collects the interlayer vacuum data in real time through the pressure probe 35 and transmits it to the intelligent terminal 37.

[0070] S2. When the interlayer vacuum level reaches the preset value, the intelligent terminal 37 controls the vacuum pump 39 to stop working and closes the solenoid valve 47 to maintain the interlayer vacuum state.

[0071] S3, the intelligent terminal 37 continuously receives vacuum monitoring data from the vacuum detector 301. If an abnormal change in vacuum level is detected, the alarm system is triggered.

[0072] S4. Airflow disturbance near the leak point triggers the corresponding leak detection pendulum 26 to swing, sensor 28 collects vibration signal and locates the leak location, and intelligent terminal 37 performs dual verification by combining vacuum data and sensor signal.

[0073] S5. After confirming the leak, the intelligent terminal 37 controls the vacuum pump 39 to restart to maintain the vacuum level of the interlayer and simultaneously sends the location information of the leak point to the maintenance personnel.

[0074] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of the present embodiments, all of which are within the protection scope of the present embodiments.

Claims

1. A vacuum degree detection device for a liquid hydrogen double-walled spherical tank, characterized in that, include: A double-layered spherical tank (11) is provided with an internal measurement and positioning mechanism (2) in the interlayer of the double-layered spherical tank (11). The internal measurement positioning mechanism (2) includes an inner ring tube (23), several seam-following arms (24) and a vacuum degree detection component. The inner ring tube (23) is fixed in the top interlayer of the double-layer spherical tank (11). Several seam-following arms (24) are fixedly connected to the inner ring tube (23) below and communicate with it along the longitudinal weld seam extension direction. Sensors (28) are arrayed on each of the seam arms (24), and a deflating pendulum (26) is suspended below each sensor (28) by a pull rope (29). The vacuum detection component includes a smart terminal (37) and a vacuum detector (301), and all sensor components (28) are connected to the smart terminal (37) via signals. When airflow disturbance occurs at the venting point in the double-layer spherical tank (11), the corresponding venting pendulum (26) swings under the impact of the airflow, triggering the corresponding sensor (28) to collect data and transmit it to the intelligent terminal (37) to accurately locate the leaking point. The intelligent terminal (37) compares the measured vacuum value with the vacuum detector (301) to avoid false alarms.

2. The vacuum degree detection device for a liquid hydrogen double-walled spherical tank according to claim 1, characterized in that, The vacuum degree detection component also includes a central control cabinet (31), which has two independent space control rooms (36) and a pump room (38) inside. The intelligent terminal (37) is located in the central control room (36). The pump room (38) is fixedly installed with a vacuum suction pump (39) and a vacuum detector (301). The intelligent terminal (37) is connected to the vacuum suction pump (39) and the vacuum detector (301) respectively.

3. The vacuum degree detection device for a liquid hydrogen double-walled spherical tank according to claim 2, characterized in that, The back of the main control cabinet (31) is provided with a conduit (32) and a suction pipe (33). The ends of the conduit (32) and the suction pipe (33) away from the main control cabinet (31) are fixedly connected to an outer ring pipe (21). The outer ring pipe (21) is located on the top periphery of the double-layer spherical tank (11). Several through-wall pipes (22) are fixedly connected to the inner side of the outer ring pipe (21). A pipe plug (41) is fixedly installed inside the through-wall pipe (22).

4. The vacuum degree detection device for a liquid hydrogen double-walled spherical tank according to claim 3, characterized in that, The plug head (41) has three holes inside, namely a pipe hole (42), a wire hole (44) and a suction port (46). A branch pipe (25) is inserted through the pipe hole (42). One end of the branch pipe (25) is fixedly connected to the inner ring pipe (23) in the double-layer spherical tank (11) and they are interconnected. The other end of the branch pipe (25) enters the wire pipe (32) along the wall-penetrating pipe (22) and the outer ring pipe (21) in sequence. The inner wall of the pipe hole (42) is provided with several skirt-shaped anti-reverse ring plates (43).

5. The vacuum degree detection device for a liquid hydrogen double-walled spherical tank according to claim 4, characterized in that, The probe wire (34) is inserted inside the wire hole (44). One end of the probe wire (34) is equipped with a pressure probe (35) and is located in the interlayer of the double-layer spherical tank (11). The inner wall of the wire hole (44) is equipped with several skirt-shaped anti-reflection ring plates (45). The end of the probe wire (34) away from the pressure probe (35) enters the wire pipe (32) along the wall-penetrating pipe (22) and the outer ring pipe (21) in sequence, and finally enters the pump chamber (38) and connects with the vacuum detector (301).

6. The vacuum degree detection device for a liquid hydrogen double-walled spherical tank according to claim 5, characterized in that, The suction port (46) is equipped with a solenoid valve (47), which is connected to and controlled by the smart terminal (37).

7. The vacuum degree detection device for a liquid hydrogen double-walled spherical tank according to claim 6, characterized in that, The internal equidistant array of the seam-side arm (24) has several air windows (27), and the sensor (28) is fixed on the top of the air window (27). The air windows (27) in the same seam-side arm (24) are interconnected through the wire channel (201).

8. The vacuum degree detection device for a liquid hydrogen double-walled spherical tank according to claim 7, characterized in that, The outer wall of the venting pendulum (26) is provided with several arc-shaped air guide grooves (204) and several thin springs (203), and the thin springs (203) do not contact the inner wall of the vent window (27).

9. The vacuum degree detection device for a liquid hydrogen double-walled spherical tank according to claim 8, characterized in that, The connection endpoint of the sensor (28) is fixedly provided with sensor wires (202). All sensor wires (202) are closely attached to the inner wall of the ventilation window (27) and enter the inner ring pipe (23) along the wire passage (201) before being connected to the smart terminal (37).

10. A method for detecting the vacuum degree of a liquid hydrogen double-walled spherical tank as described in claim 9, characterized in that, Includes the following steps: S1. Start the vacuum pump (39) and solenoid valve (47) to extract the air in the interlayer of the double-layer spherical tank (11) through the suction port (46). The vacuum detector (301) collects the interlayer vacuum data in real time through the pressure probe (35) and transmits it to the smart terminal (37). S2. When the interlayer vacuum reaches the preset value, the smart terminal (37) controls the vacuum pump (39) to stop working and close the solenoid valve (47) to maintain the interlayer vacuum state. S3. The intelligent terminal (37) continuously receives vacuum monitoring data from the vacuum detector (301). If an abnormal change in vacuum is detected, the alarm system is triggered. S4. The airflow disturbance near the leak point triggers the corresponding leak measurement pendulum (26) to swing, the sensor (28) collects the vibration signal and locates the leak location, and the smart terminal (37) performs dual verification by combining vacuum data and sensor signals. S5. After confirming the leak, the smart terminal (37) controls the vacuum pump (39) to restart to maintain the vacuum level of the interlayer and simultaneously sends the location information of the leak point to the maintenance personnel.

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