An annular sealing device based on liquid nitrogen instantaneous thin water spraying

Abstract

The utility model relates to a kind of annular sealing device based on liquid nitrogen instantaneous freezing spray thin water, and it relates to sealing technical field, it includes annular telescopic tensioning mechanism, monitoring mechanism and spraying mechanism;Annular telescopic tensioning mechanism, monitoring mechanism and spraying mechanism are electrically connected by control system between through control system electrically controlled connection.The extremely low temperature characteristics of liquid nitrogen, instantaneously freeze leakage medium, form temporary solid barrier and block leakage path, while low-temperature shrinkage effect reduces the gap between metal cracks, supplemented by inert nitrogen dilution dangerous gas, significantly reduce the risk of explosion or poisoning.It adapts to multiple scene requirements, especially suitable for chemical industry, ocean engineering and other high-risk fields of leakage emergency treatment, can greatly improve repair efficiency and reduce environmental and personnel risk.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, specifically to an annular sealing device based on liquid nitrogen instantaneous condensation spraying of thin water. Background Technology

[0002] Pipelines, containers, shafts, submarines, and ship hulls are common fluid-related sealing structures in daily life. However, the rupture of these seals often leads to serious problems such as production restrictions, marine pollution, toxic gas leaks, and personal injuries. Combining liquid nitrogen instantaneous condensation technology with sealing technology would greatly facilitate the maintenance of the sealed components. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a ring-shaped sealing device based on the instantaneous condensation and spraying of thin water with liquid nitrogen. Utilizing the extremely low temperature characteristics of liquid nitrogen, the leaking medium is instantly frozen, forming a temporary solid barrier to block the leak path. Simultaneously, the low-temperature contraction effect reduces the gaps in metal cracks, and the use of inert nitrogen to dilute hazardous gases significantly reduces the risk of explosion or poisoning. It is adaptable to various scenarios, especially suitable for emergency leak handling in high-risk fields such as chemical engineering and marine engineering, and can greatly improve repair efficiency while reducing environmental and personnel risks.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: it includes a ring-shaped telescopic tensioning mechanism, a monitoring mechanism, and a spraying mechanism; the ring-shaped telescopic tensioning mechanism, the monitoring mechanism, and the spraying mechanism are electrically connected through a control system; the monitoring mechanism monitors the distance between the ring-shaped telescopic tensioning mechanism and the sealed component in real time, thereby controlling the spraying mechanism to spray water to achieve liquid nitrogen cooling, and thus completing the sealing operation.

[0005] Preferably, the annular telescopic tensioning mechanism comprises:

[0006] A servo motor, which is fixed to the ground and has an external spur gear connected to its output end;

[0007] The double-sided gear circle has an inner ring tooth integrally formed on its inner ring surface and an outer ring tooth integrally formed on its outer ring surface. The outer ring tooth meshes with an external spur gear, and the inner ring tooth meshes with several internal spur gears mounted on an annular bracket. The internal spur gears mesh with a rack, which movably passes through a sliding groove in an annular disk. The annular bracket is fixed in the middle of the bottom of the annular disk. The double-sided gear circle is movably connected to the annular disk.

[0008] The lobes are multiple in number and are movably disposed in the inner ring position of the annular disk, with the outer ring surface of the lobes fixed to the inner end of the rack.

[0009] Preferably, a fixing washer is installed on the sliding groove using fixing bolts. The fixing washer is pressed onto the rack and plays a positioning and guiding role for the rack.

[0010] Preferably, the upper surface of the double-sided toothed circle is integrally formed with several connecting rods, and the bottom surface of the annular disk is provided with several arc-shaped grooves. The connecting rods are movably inserted into the arc-shaped grooves, which not only connect the double-sided toothed circle and the annular disk, but also guide the rotation of the double-sided toothed circle.

[0011] Preferably, the spraying mechanism comprises:

[0012] The liquid nitrogen tube has several liquid nitrogen tubes installed on the inner ring surface of each valve, and the liquid nitrogen tubes between adjacent valves are connected by corrugated pipes; a micro circulation pump is installed in one of the liquid nitrogen tubes to accelerate the liquid nitrogen circulation flow rate in the liquid nitrogen tube, thereby shortening the freezing time of the water; two adjacent liquid nitrogen tubes are connected to the liquid nitrogen tank outlet and return outlet by pipes respectively.

[0013] The water pipes are installed on the inner ring surface of each petal, with the water pipes and liquid nitrogen pipes arranged alternately. The water pipes between adjacent petals are connected by corrugated pipes, and several nozzles are connected through the inner ring surface of the water pipes. One of the water pipes is connected to the liquid outlet of the water tank by a pipe, and a water pump is installed in the water tank.

[0014] Preferably, the monitoring agency comprises:

[0015] An ultrasonic flow meter is installed inside a water tank and is electrically connected to a water pump inside the water tank via a control system.

[0016] The valve pressure sensor comprises several valves, each mounted on both ends of several valves using several semi-flexible pads to monitor the valve pressure. When the pressure is too high, the control system controls the servo motor to stop working.

[0017] The inner distance sensor consists of several sensors, which are equally installed on the inner ring surfaces at both ends of each lobe. The inner distance sensor is connected to the servo motor via a control system to monitor the radial distance between the lobe and the sealed component in real time.

[0018] Front-end distance sensors are installed on both the front and rear sides of the petal, and the front-end distance sensors are connected to the servo motor via the control system to monitor the axial distance between the sealed component and the petal in real time.

[0019] A liquid nitrogen tube wall pressure sensor is installed on the outer side of the liquid nitrogen tube wall and is electrically connected to the water pump in the water tank through a control system; it is used to monitor the pressure changes of the liquid nitrogen tube in real time.

[0020] In this invention, when sealing the sealed component, the distance sensors at the front ends of both sides of the flap detect the distance between the sealed component and the flap (if the sealed component is stationary, this monitoring is not required) and transmit the speed information to the control system (not shown in the control system diagram, but can be installed on the ground on one side of the servo motor using an electrical control cabinet). The control system analyzes the motion information and transmits it to the servo motor, which then starts synchronous operation upon receiving the command. The inner side distance sensor on the inner side of the flap monitors the distance between the sealed component and the inner side of the flap and transmits the distance information to the control system. The control system then starts the servo motor, which drives the outer spur gear. The outer spur gear meshes with the outer ring gear, causing the inner ring gear to move synchronously. The inner ring gear meshes with the inner spur gear, causing the inner ring gear to move. The inner spur gear meshes with the rack, causing the rack to move. The rack moves horizontally in the sliding groove within the annular disc, thus driving the flap. During the process of the flap closing into a ring, the flap pressure sensors at both ends of the semi-flexible pad and the inner side of the flap... Distance sensors monitor the pressure at both ends of the flap and the distance between it and the sealed component in real time. When the inner distance sensor detects that the distance between the flap and the sealed component reaches the set position, the control system stops the servo motor, indicating that the flap has reached the designated position. Simultaneously, the control system starts a micro-circulation pump to pressurize the liquid nitrogen in the liquid nitrogen tank and circulate it within the liquid nitrogen tube. When the liquid nitrogen circulates within the tube, the pressure sensor on the tube wall detects that the pressure in the liquid nitrogen tube is increasing. In this case, the control system starts a water pump in the tank, pumping water from the tank into the water pipe and spraying it through nozzles into the gap between the sealed component and the liquid nitrogen tube. (During the spraying process, the ultrasonic flow meter in the tank monitors the flow rate in real time and adjusts the flow rate according to different sealing requirements.) Due to the cooling effect of the liquid nitrogen, a thin layer of ice forms on the surface of the sealed component. As the volume of the frozen water increases, it compresses the liquid nitrogen tube. When the pressure sensor on the tube wall detects that the pressure reaches the preset value, the control system stops the water pump in the tank. Thus, the entire sealing process is completed.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides an annular sealing device based on liquid nitrogen instantaneous condensation spraying of thin water. Through the extremely low temperature characteristics of liquid nitrogen, the leaking medium (such as liquid, gas or chemical substance) can be instantly frozen to form a temporary solid barrier to block the leak path. At the same time, the low temperature contraction effect reduces the gap of metal cracks, and the inert nitrogen gas is used to dilute the dangerous gas, which significantly reduces the risk of explosion or poisoning. It is especially suitable for emergency treatment of leaks in high-risk fields such as chemical industry and marine engineering, which can greatly improve the repair efficiency and reduce environmental and personnel risks. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a top view of the present invention.

[0024] Figure 3 This is the front view of this utility model.

[0025] Figure 4 This is a schematic diagram showing the installation positions of the valve, water pipe, liquid nitrogen pipe, inner distance sensor, valve pressure sensor, and liquid nitrogen pipe wall pressure sensor in this utility model.

[0026] Figure 5 This is a schematic diagram of the internal structure of a liquid nitrogen tube.

[0027] Figure 6 This is a schematic diagram of the rack structure in this utility model.

[0028] Figure 7 This is a schematic diagram of the bottom of the annular disk in this utility model.

[0029] Figure 8 This is a schematic diagram of the structure of the double-sided toothed circle in this utility model.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Sealed component; 2. Nozzle; 3. Flap; 4. Semi-flexible pad; 5. Inner ring spur gear; 6. Rack; 7. Outer ring spur gear; 8. Servo motor; 9. Double-sided gear circle; 10. Outer ring gear; 11. Inner ring gear; 12. Fixing bolt; 13. Fixing gasket; 14. Flap pressure sensor; 15. Front end distance sensor; 16. Water tank; 17. Liquid nitrogen tank; 18. Miniature circulating pump; 19. Ultrasonic flow meter; 20. Liquid nitrogen pipe; 21. Water pipe; 22. Inner side distance sensor; 23. Annular disc; 24. Sliding groove; 25. Annular bracket; 26. Corrugated pipe; 27. Liquid nitrogen pipe wall pressure sensor; 28. Arc groove; 29. ​​Connecting rod. Detailed Implementation

[0032] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. The preferred embodiments described are only examples. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] like Figures 1-8 As shown, this specific embodiment adopts the following technical solution: it includes a ring telescopic tensioning mechanism, a monitoring mechanism, and a spraying mechanism;

[0034] The annular telescopic tensioning mechanism includes:

[0035] Servo motor 8, which is fixed to the ground, has an external spur gear 7 connected to its output end;

[0036] The double-sided toothed circle 9 has an inner ring tooth 11 integrally formed on its inner ring surface and an outer ring tooth 10 integrally formed on its outer ring surface. The outer ring tooth 10 meshes with an outer spur gear 7, and the inner ring tooth 11 meshes with several inner spur gears 5 mounted on the annular support 25. The inner spur gears 5 mesh with a rack 6, which is movably inserted into a sliding groove 24 in the annular disc 23. A fixing washer 13 is mounted on the sliding groove 24 using fixing bolts 12. The fixing washer 13 presses against the rack 6, providing a positioning and guiding function for the rack 6. The frame 25 is fixed to the bottom center of the annular disk 23 by fixing bolts 12; the double-sided toothed circle 9 is movably connected to the annular disk 23, and several connecting rods 29 are integrally formed on the upper surface of the double-sided toothed circle 9. Several arc-shaped grooves 28 are opened on the bottom surface of the annular disk 23. The connecting rods 29 are movably inserted into the arc-shaped grooves 28 (the end placed in the arc-shaped groove 28 has a T-shaped structure, which can be movably connected with the arc-shaped groove 28 to prevent it from falling off). It not only connects the double-sided toothed circle 9 and the annular disk 23, but also guides the rotation of the double-sided toothed circle 9.

[0037] The petals 3 are multiple and are movably disposed in the inner ring position of the annular disk 23, and the outer ring surface of the petals 3 is fixed to the inner end of the rack 6;

[0038] The spraying mechanism includes:

[0039] The liquid nitrogen tubes 20 are installed on the inner ring surface of each lobe 3. The liquid nitrogen tubes 20 between adjacent lobe 3 are connected by a corrugated pipe 26. A micro circulation pump 18 is installed in one of the liquid nitrogen tubes 20 to accelerate the liquid nitrogen circulation flow rate in the liquid nitrogen tube 20, thereby shortening the freezing time of the water. Two adjacent liquid nitrogen tubes 20 are respectively connected to the outlet and return port of the liquid nitrogen tank 17 by pipes.

[0040] Water pipe 21, several water pipes 21 are installed on the inner ring surface of each petal 3. The water pipes 21 are arranged alternately with the liquid nitrogen pipe 20 and do not contact each other. The water pipes 21 between adjacent petals 3 are connected by corrugated pipes 26. Several nozzles 2 are connected through the inner ring surface of the water pipe 21. One of the water pipes 21 is connected to the liquid outlet of the water tank 16 by a pipe. A water pump is installed in the water tank 16.

[0041] The monitoring agency includes:

[0042] An ultrasonic flow meter 19 is installed inside a water tank 16 and is electrically connected to a water pump inside the water tank 16 via a control system.

[0043] The valve pressure sensor 14 consists of several valves, which are installed at both ends of several valves 3 using several semi-flexible pads 4 to monitor the pressure of the valves 3. When the pressure is too high, the servo motor 8 is controlled to stop working by the control system.

[0044] The inner distance sensor 22 consists of several sensors, which are equally installed on the inner ring surfaces at both ends of each lobe 3. The inner distance sensor 22 is electrically connected to the servo motor 8 via the control system and is used to monitor the radial distance between the lobe 3 and the sealed component 1 in real time.

[0045] Front-end distance sensor 15: Front-end distance sensor 15 is installed on both the front and rear sides of the petal 3. The front-end distance sensor 15 is electrically connected to the servo motor 8 via the control system and is used to monitor the axial distance between the sealed part 1 and the petal 3 in real time.

[0046] Liquid nitrogen pipe wall pressure sensor 27 is installed on the outer side of the pipe wall of liquid nitrogen pipe 20 and is electrically connected to the water pump in water tank 16 through the control system; it is used to monitor the pressure change of liquid nitrogen pipe 20 in real time.

[0047] This specific implementation is applied to the sealing of vacuum tube magnetic levitation trains (hereinafter referred to as "capsule trains"): When the train is about to enter the station, the CTCS detects the speed of the "capsule train" and predicts the time from entering the station to stopping. The obtained information is transmitted to this device. The front end distance sensors 15 on both sides of the petal 3 detect the distance between the "capsule train" and the petal 3 and transmit the speed information to the control system (not shown in the control system diagram, which can be installed on the ground on one side of the servo motor 8 using an electrical control cabinet). The control system analyzes the motion information and transmits it to the servo motor 8.

[0048] After receiving the command, the servo motor 8 starts to run synchronously. The inner distance sensor 22 on the inner side of the petal 3 monitors the distance between the "capsule train" and the inner side of the petal 3 and transmits the distance information to the control system. The control system controls the servo motor 8 to start. The servo motor 8 drives the outer spur gear 7 to run. The outer spur gear 7 meshes with the outer ring gear 10, thereby driving the outer ring gear 10 to run. The inner ring gear 11 runs synchronously. The inner ring gear 11 meshes with the inner spur gear 5. When the inner ring gear 11 runs, it drives the inner spur gear 5 to run. The inner spur gear 5 meshes with the rack 6 and drives the rack 6 to run. The rack 6 moves horizontally in the sliding groove 24 in the annular disk 23, thereby driving the petal 3 to run.

[0049] During the process of the petals 3 closing into a ring, the petal pressure sensors 14 at both ends of the semi-flexible pad 4 and the inner distance sensors 22 at both ends of the petals 3 monitor the pressure information at both ends of the petals 3 and the distance information between them and the "capsule train" in real time. When the inner distance sensor 22 detects that the distance between the petals 3 and the "capsule train" reaches the set position, the control system controls the servo motor 8 to stop running, that is, the petals 3 have reached the designated position. At the same time, the control system controls the micro circulation pump 18 to start working, pressurizing the liquid nitrogen in the liquid nitrogen tank 17 and circulating it in the liquid nitrogen tube 20.

[0050] When liquid nitrogen circulates in the liquid nitrogen tube 20, the liquid nitrogen tube wall pressure sensor 27 detects that the pressure in the liquid nitrogen tube 20 is increasing. Then, the control system controls the water pump in the water tank 16 to start, pumping the water in the water tank 16 into the water pipe 21, and spraying it through the nozzle 2 into the gap between the surface of the "capsule train" and the liquid nitrogen tube 20. (During the spraying process, the ultrasonic flow meter 19 in the water tank 16 monitors the flow rate in real time and adjusts the flow rate in real time according to different sealing requirements.) Due to the cooling effect of liquid nitrogen, a thin layer of ice forms on the surface of the "capsule train". As the volume of the frozen water increases, it squeezes the liquid nitrogen tube 20. When the liquid nitrogen tube wall pressure sensor 27 detects that the pressure has reached the preset value, the control system controls the water pump in the water tank 16 to stop spraying water. At this point, the entire sealing action is completed.

[0051] When the "capsule train" needs to leave the platform, the control system controls the servo motor 8 to run in reverse. As the petals 3 leave, the ice breaks, and the "capsule train" can then leave the platform.

[0052] Compared with the prior art, the beneficial effects of this utility model are:

[0053] 1. Utilizing a ring-shaped telescopic tensioning mechanism, it can operate normally within a limited space;

[0054] 2. This device is applicable to multiple scenarios, and different sealing effects can be achieved by using different control systems;

[0055] 3. By utilizing the ultra-low temperature of liquid nitrogen and the low melting point of water, "ice" can be formed quickly and effectively;

[0056] 4. This device primarily employs gear mechanisms, which feature high transmission efficiency, stable transmission ratio, compact structure, strong load-bearing capacity, and reliable operation with a long service life. It also ensures rapid response within a short timeframe, achieving precise sealing.

[0057] For those skilled in the art, modifications can be made to the technical solutions described in the foregoing embodiments, and equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A ring-shaped sealing device based on liquid nitrogen instantaneous condensation spraying of thin water, characterized in that: It includes a ring-shaped telescopic tensioning mechanism, a monitoring mechanism, and a spraying mechanism; the ring-shaped telescopic tensioning mechanism, the monitoring mechanism, and the spraying mechanism are electrically connected via a control system; the ring-shaped telescopic tensioning mechanism includes: Servo motor (8), which is fixed on the ground and has an external spur gear (7) connected to its output end; A double-sided toothed circle (9) has an inner ring tooth (11) integrally formed on its inner ring surface and an outer ring tooth (10) integrally formed on its outer ring surface. The outer ring tooth (10) meshes with an outer ring spur gear (7), and the inner ring tooth (11) meshes with several inner ring spur gears (5) mounted on an annular bracket (25). The inner ring spur gears (5) mesh with a rack (6), and the rack (6) is movably inserted into a sliding groove (24) opened in an annular disc (23). The annular bracket (25) is fixed in the middle of the bottom of the annular disc (23). The double-sided toothed circle (9) and the annular disc (23) are movably connected. The petals (3) are several in number and are movably arranged in the inner ring position of the annular disk (23), and the outer ring surface of the petals (3) is fixed to the inner end of the rack (6).

2. The annular sealing device based on liquid nitrogen instantaneous condensation spraying of thin water according to claim 1, characterized in that: A fixing washer (13) is installed on the sliding groove (24) by fixing bolts (12), and the fixing washer (13) is pressed on the rack (6).

3. The annular sealing device based on liquid nitrogen instantaneous condensation spraying of thin water according to claim 2, characterized in that: The upper surface of the double-sided toothed circle (9) is integrally formed with several connecting rods (29), and the bottom surface of the annular disk (23) is provided with several arc-shaped grooves (28), in which the connecting rods (29) are movably inserted.

4. The annular sealing device based on liquid nitrogen instantaneous condensation spraying of thin water according to claim 1, characterized in that: The spraying mechanism includes: Liquid nitrogen tubes (20) are installed on the inner ring surface of each lobe (3). The liquid nitrogen tubes (20) between adjacent lobe (3) are connected by a corrugated pipe (26). A micro circulation pump (18) is installed in one of the liquid nitrogen tubes (20) to accelerate the liquid nitrogen circulation flow rate in the liquid nitrogen tube (20) and thus shorten the freezing time of water. Two adjacent liquid nitrogen tubes (20) are connected to the outlet and return port of the liquid nitrogen tank (17) by pipes respectively. Water pipe (21), several water pipes (21) are installed on the inner ring surface of each petal (3), the water pipes (21) and liquid nitrogen pipes (20) are arranged alternately, the water pipes (21) between adjacent petals (3) are connected by corrugated pipes (26), and several nozzles (2) are connected through the inner ring surface of the water pipes (21); one of the water pipes (21) is connected to the outlet of the water tank (16) by a pipe, and a water pump is installed in the water tank (16).

5. The annular sealing device based on liquid nitrogen instantaneous condensation spraying of thin water according to claim 4, characterized in that: The monitoring agency includes: An ultrasonic flow meter (19) is installed in a water tank (16) and is electrically connected to a water pump in the water tank (16) through a control system. Lobe pressure sensor (14), there are several lobe pressure sensors (14), which are installed at both ends of several lobe (3) using several semi-flexible pads (4); The inner distance sensor (22) consists of several sensors, which are installed in equal numbers on the inner ring surfaces at both ends of each lobe (3). The inner distance sensor (22) is electrically connected to the servo motor (8) via the control system. Front-end distance sensor (15): The front-end distance sensor (15) is installed on both the front and rear sides of the petal (3), and the front-end distance sensor (15) is electrically connected to the servo motor (8) through the control system. Liquid nitrogen pipe wall pressure sensor (27) is installed on the outer side of the pipe wall of liquid nitrogen pipe (20) and is electrically connected to the water pump in water tank (16) through the control system.

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