Dewar liquid nitrogen control system for high-temperature superconducting maglev vehicle

Abstract

The utility model provides a Dewar liquid nitrogen control system for a high-temperature superconducting magnetic levitation vehicle, which relates to the technical field of Dewar liquid nitrogen control and comprises a liquid storage tank suitable for storing liquid nitrogen and connected with the vehicle. The vehicle is matched with the permanent magnet track through a plurality of Dewar wares so as to realize vehicle suspension; the pipeline assembly is suitable for communicating the liquid storage tank with the plurality of Dewar; wherein the pipeline assembly is selectively communicated with the gas storage device so as to accelerate discharge of the liquid nitrogen in the plurality of Dewar wares when the vehicle is overhauled. According to the utility model, the pipeline assembly is selectively communicated with the gas storage device, so that the liquid nitrogen in the Dewar can be quickly discharged, the suspension state of the vehicle can be quickly relieved, the maintenance time is further shortened, the maintenance efficiency of the vehicle is improved, and the shutdown time and the operation cost of the vehicle are reduced; in addition, the pressure sensor is innovatively adopted to monitor the liquid nitrogen condition in the Dewar, and the problem that the liquid level height of the liquid nitrogen in the Dewar is not accurately monitored under the complex working condition in the vehicle running process is solved.

Description

Technical Field

[0001] This utility model relates to the field of Dewar liquid nitrogen control technology, and more specifically, to a Dewar liquid nitrogen control system for high-temperature superconducting magnetic levitation vehicles. Background Technology

[0002] High-temperature superconducting magnetic levitation vehicles, as an advanced mode of transportation, possess significant advantages such as high speed, smooth operation, and low energy consumption, and have broad application prospects in the future transportation field. Their operating principle primarily relies on the diamagnetism of high-temperature superconducting materials. Liquid nitrogen cooling brings the superconducting material to a superconducting state, thereby achieving magnetic levitation and stable operation under the influence of an external magnetic field.

[0003] In high-temperature superconducting magnetic levitation vehicle systems, the Dewar is a key component for storing and maintaining the cryogenic environment of liquid nitrogen. The storage and supply of liquid nitrogen inside the Dewar is crucial for maintaining the superconducting state of the superconducting materials. Therefore, the stability and reliability of the Dewar liquid nitrogen control system directly affect the performance and safety of the high-temperature superconducting magnetic levitation vehicle.

[0004] In the existing technology, when inspecting a vehicle, it is necessary to evacuate the Dewar, that is, to remove the liquid nitrogen inside the Dewar to release the vehicle from its levitation state so that the vehicle can be inspected. However, the efficiency of removing liquid nitrogen from the Dewar is low, resulting in low vehicle inspection efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a Dewar liquid nitrogen control system for high-temperature superconducting magnetic levitation vehicles to improve the aforementioned problems. To achieve this objective, the technical solution adopted by this invention is as follows:

[0006] This application provides a Dewar liquid nitrogen control system for a high-temperature superconducting magnetic levitation vehicle, comprising: a liquid storage tank adapted to store liquid nitrogen and connected to the vehicle; multiple Dewars configured to be connected to the vehicle, wherein the vehicle levitates by cooperating with a permanent magnet track through the multiple Dewars; and a pipeline assembly adapted to connect the liquid storage tank to the multiple Dewars; wherein the pipeline assembly is optionally connected to a gas storage device to accelerate the discharge of liquid nitrogen from the multiple Dewars during vehicle maintenance.

[0007] According to some embodiments of the present invention, the pipeline assembly includes a main pipe, one end of which is connected to the liquid storage tank, and the other end of which is connected to an air valve. The air valve is selectively connected to a gas storage device, and the air valve is adapted to connect the main pipe to a plurality of Dewars.

[0008] According to some embodiments of the present invention, the pipeline assembly further includes a main valve disposed on the main pipe, the main valve being adapted to open or close the main pipe.

[0009] According to some embodiments of the present invention, the pipeline assembly further includes a multi-way valve having multiple connection ports. The multi-way valve can selectively connect at least two of the connection ports, one of which is connected to the air valve, and the remaining connection ports are respectively connected to a first branch pipe, and the multiple first branch pipes are respectively connected to multiple Dewars.

[0010] According to some embodiments of the present invention, the pipe assembly further includes a plurality of second branch pipes corresponding one-to-one with the Dewar, the plurality of second branch pipes being respectively connected to the Dewar, and the first branch pipe being connected to at least one of the second branch pipes.

[0011] According to some embodiments of the present invention, the pipeline assembly further includes a plurality of branch valves corresponding one-to-one with the second branch pipe, wherein the branch valves can selectively open or close the corresponding second branch pipe.

[0012] According to some embodiments of the present invention, the pipeline assembly further includes multiple one-way valves, and the multiple one-way valves correspond one-to-one with and are connected to the multiple second branch pipes.

[0013] According to some embodiments of the present invention, each of the Dewars is provided with a drain valve, which is adapted to connect or isolate the interior of the corresponding Dewar from the external environment.

[0014] According to some embodiments of the present invention, each of the Dewars is provided with a pressure sensor, which is adapted to detect the gas pressure inside the corresponding Dewar.

[0015] According to some embodiments of the present invention, a liquid level sensor is provided inside the storage tank. The liquid level sensor is adapted to detect the liquid nitrogen level inside the storage tank. The Dewar liquid nitrogen control system further includes a control component. The control component is communicatively connected to the liquid level sensor, the pipeline assembly, and multiple pressure sensors. The control component is adapted to control the operation of the pipeline assembly according to the liquid level sensor and the multiple pressure sensors, so that the pipeline assembly can selectively connect or disconnect the storage tank from the Dewar.

[0016] The beneficial effects of this utility model are as follows:

[0017] This invention allows for selective connection between a pipeline assembly and a gas storage device to rapidly discharge liquid nitrogen from the Dewar, thereby quickly releasing the vehicle from its suspended state, shortening maintenance time, improving vehicle maintenance efficiency, and reducing vehicle downtime and operating costs.

[0018] Other features and advantages of this invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing embodiments of the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the Dewar liquid nitrogen control system of this utility model;

[0021] Figure 2 This is a front view of the Dewar liquid nitrogen control system of this utility model;

[0022] Figure 3 This is a side view of the Dewar liquid nitrogen control system of this utility model;

[0023] Figure 4 This is a schematic diagram of the control principle of the Dewar liquid nitrogen control system of this utility model.

[0024] Marked in the image:

[0025] 10. Storage tank; 11. Liquid level sensor; 20. Dewar; 21. Drain valve; 22. Pressure sensor; 31. Main pipe; 32. Air valve; 33. Main valve; 34. Multi-way valve; 35. First branch pipe; 36. Second branch pipe; 37. Branch valve; 38. Check valve; 40. Control components. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0027] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this utility model, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] like Figures 1-4 As shown, this embodiment provides a Dewar liquid nitrogen control system for a high-temperature superconducting magnetic levitation vehicle, including: a liquid storage tank 10, Dewars 20, and a pipeline assembly. The liquid storage tank 10 is adapted to store liquid nitrogen and is connected to the vehicle. Multiple Dewars 20 are configured to be connected to the vehicle. The vehicle is levitated by cooperating with a permanent magnet track through multiple Dewars 20. The pipeline assembly is adapted to connect the liquid storage tank 10 to the multiple Dewars 20. The pipeline assembly can be selectively connected to a gas storage device to accelerate the discharge of liquid nitrogen from the multiple Dewars 20 during vehicle maintenance.

[0029] In some embodiments, the storage tank 10 is used to store liquid nitrogen and is adapted to be connected to a vehicle to provide a liquid nitrogen source for the Dewar liquid nitrogen control system. It is worth noting that the storage tank 10 is located inside the vehicle to facilitate maintenance and liquid nitrogen refilling. Of course, the storage tank 10 can also be located outside the vehicle; this is not a limitation. Multiple Dewars 20 are constructed, and each Dewar 20 is connected to the vehicle. The vehicle uses multiple Dewars 20 in conjunction with a permanent magnet track to achieve levitation. The Dewars 20 contain liquid nitrogen to maintain the cryogenic environment of the superconducting material and ensure the superconducting performance of the Dewars 20 themselves. A piping assembly is used to connect the storage tank 10 to the multiple Dewars 20 to achieve liquid nitrogen transport. Specifically, the piping assembly can optionally be connected to a gas storage device to accelerate the discharge of liquid nitrogen from the multiple Dewars 20.

[0030] Understandably, the storage tank 10 stores liquid nitrogen and delivers it to each Dewar 20 via a piping assembly. During normal operation, the liquid nitrogen maintains the cryogenic environment within the Dewar 20, ensuring the superconducting performance of the superconducting material. When vehicle maintenance is required, the piping assembly connects to a gas storage device, which can supply air or other gases into the piping assembly. This air or other gas can rapidly expel the liquid nitrogen from the Dewar 20, avoiding the slow discharge problem of traditional methods. This allows the vehicle to quickly de-levitate, facilitating rapid vehicle maintenance and thus improving maintenance efficiency.

[0031] According to the present invention, the Dewar liquid nitrogen control system for high-temperature superconducting magnetic levitation vehicles can be selectively connected to a gas storage device through a pipeline assembly to quickly discharge liquid nitrogen from the Dewar 20, thereby quickly releasing the vehicle from its levitation state, shortening maintenance time, improving vehicle maintenance efficiency, and reducing vehicle downtime and operating costs.

[0032] It is worth mentioning that injecting air or other gases to help remove liquid nitrogen can avoid safety problems that may be caused by residual liquid nitrogen during maintenance, such as frostbite.

[0033] According to some embodiments of the present invention, the pipeline assembly includes a main pipe 31, one end of which is connected to a liquid storage tank 10, and the other end of which is connected to an air valve 32. The air valve 32 can be selectively connected to a gas storage device, and the air valve 32 is adapted to connect the main pipe 31 to a plurality of Dewars 20.

[0034] In some embodiments, one end of the main pipe 31 is connected to the storage tank 10 for conveying liquid nitrogen, and an air valve 32 is connected to the other end of the main pipe 31. The air valve 32 has two key functions. First, the air valve 32 can be selectively connected to a gas storage device to help quickly drain liquid nitrogen from the Dewar 20 during vehicle maintenance. Second, the air valve 32 is also adapted to connect the main pipe 31 to multiple Dewar 20s to facilitate the transfer of liquid nitrogen from the storage tank 10 to the Dewar 20.

[0035] Under normal operating conditions, air valve 32 is closed to the gas storage device, and main pipe 31 is connected to Dewar 20, so that liquid nitrogen can be delivered from the storage tank 10 through main pipe 31 and air valve 32 to each Dewar 20.

[0036] When it is necessary to quickly drain the liquid nitrogen from the Dewar 20 (i.e. during vehicle maintenance), the main pipe 31 is disconnected from the Dewar 20, and the gas storage device is connected to the Dewar 20. At this time, the gas (such as air) in the gas storage device enters each Dewar 20 through the air valve 32 to help drain the liquid nitrogen from each Dewar 20 quickly.

[0037] According to some embodiments of the present invention, the pipeline assembly further includes a main valve 33, which is disposed on the main pipe 31 and is adapted to open or close the main pipe 31.

[0038] In some embodiments, during normal vehicle operation, the main valve 33 opens the main pipe 31. At this time, the liquid reservoir 10 is connected to the air valve 32 via the main pipe 31, and the liquid nitrogen in the liquid reservoir 10 can sequentially enter each Dewar 20 through the main pipe 31 and the air valve 32. When the vehicle needs maintenance, the main valve 33 closes the main pipe 31. At this time, the liquid reservoir 10 and the air valve 32 are isolated from each other. The operator can control the air valve 32 to connect with the gas storage device, and the gas in the gas storage device can enter each Dewar 20 through the air valve 32 to help the liquid nitrogen in the Dewar 20 be discharged.

[0039] Understandably, during vehicle maintenance, the main valve 33 controls the main pipe 31 to close, so as to prevent gas in the gas storage device from entering the liquid storage tank 10 through the main pipe 31, thereby preventing the liquid nitrogen in the liquid storage tank 10 from being contaminated or causing a safety accident.

[0040] According to some embodiments of the present invention, the pipeline assembly further includes a multi-way valve 34, which has multiple connection ports. The multi-way valve 34 can selectively connect at least two connection ports, one of which is connected to an air valve 32, and the remaining connection ports are respectively connected to a first branch pipe 35. The multiple first branch pipes 35 are respectively connected to multiple Dewar 20s.

[0041] In some embodiments, the flow path of liquid nitrogen is: storage tank 10 - main pipe 31 - air valve 32 - multi-way valve 34 - first branch pipe 35 - Dewar 20. The multi-way valve 34 of this application can selectively connect at least two ports to each other. Therefore, the multi-way valve 34 can control the connection relationship of multiple ports according to actual needs, selectively controlling the connection between the storage tank 10 and one or more Dewar 20s, thereby achieving targeted replenishment of liquid nitrogen to the Dewar 20 to ensure the normal operation of the vehicle.

[0042] Of course, by controlling the connection relationship of multiple ports through the control valve, the gas storage device can be connected to one or more Dewar 20s in a targeted manner, thereby realizing the targeted drainage of Dewar 20s.

[0043] According to some embodiments of the present invention, the pipe assembly further includes a plurality of second branch pipes 36 corresponding one-to-one with the Dewar 20, the plurality of second branch pipes 36 being connected to the Dewar 20 respectively, and the first branch pipe 35 being connected to at least one second branch pipe 36.

[0044] In some embodiments, the number of second branch pipes 36 corresponds one-to-one with the number of Dewar 20s, and each Dewar 20 is connected and communicates with its corresponding second branch pipe 36. Multiple second branch pipes 36 are respectively connected to their corresponding Dewar 20s for the input of liquid nitrogen or gas. Simultaneously, a first branch pipe 35 is connected to at least one second branch pipe 36, forming a complete liquid nitrogen delivery or discharge path from the main pipe 31 to the Dewar 20. That is, liquid nitrogen is delivered from the storage tank 10 through the main pipe 31, air valve 32, multi-way valve 34, and first branch pipe 35 to a specific second branch pipe 36, and finally enters the corresponding Dewar 20.

[0045] Understandably, by setting an independent second branch pipe 36 for each Dewar 20, it is possible to ensure that liquid nitrogen is accurately delivered to each Dewar 20, meeting the liquid nitrogen requirements of different Dewar 20s. Moreover, the independent setting of the second branch pipe 36 ensures that if a Dewar liquid nitrogen control system fails in one Dewar 20 or the second pipe, it will not affect the normal operation of other Dewar 20s, thus improving the overall reliability of the Dewar liquid nitrogen control system.

[0046] According to some embodiments of the present invention, the pipeline assembly also includes a plurality of branch valves 37 corresponding one-to-one with the second branch pipe 36, and the branch valves 37 can selectively open or close the corresponding second branch pipe 36.

[0047] In some embodiments, during liquid nitrogen delivery, liquid nitrogen can be allowed to enter the Dewar 20 from the first branch pipe 35 through the second branch pipe 36 by opening the corresponding branch pipe valve 37. When it is necessary to discharge the liquid nitrogen from the Dewar 20, gas can be allowed to enter the Dewar 20 through the second branch pipe 36 by controlling the opening and closing state of the branch pipe valve 37, thus pushing the liquid nitrogen out. Since each second branch pipe 36 is equipped with an independent branch pipe valve 37, independent control of the liquid nitrogen delivery and discharge of each Dewar 20 can be achieved.

[0048] Understandably, the branch valve 37 allows the Dewar liquid nitrogen control system to flexibly control the liquid nitrogen delivery and discharge of each Dewar 20 as needed, meeting the requirements under different operating conditions.

[0049] When a Dewar 20 malfunctions or requires maintenance, the connection between that Dewar 20 and the Dewar liquid nitrogen control system can be severed by closing the corresponding branch valve 37, preventing liquid nitrogen leakage or other safety accidents. Furthermore, during system commissioning or maintenance, different operating conditions can be simulated by independently controlling the on / off state of each branch valve 37, facilitating performance testing and troubleshooting of the Dewar liquid nitrogen control system.

[0050] According to some embodiments of the present invention, the pipeline assembly also includes a plurality of one-way valves 38, which correspond one-to-one with and are connected to a plurality of second branch pipes 36.

[0051] In some embodiments, during the process of liquid nitrogen being transported from the storage tank 10 to the Dewar 20 via the main pipe 31, air valve 32, multi-way valve 34, first branch pipe 35 and second branch pipe 36, the one-way valve 38 ensures that the liquid nitrogen can only flow in this direction, preventing the liquid nitrogen from flowing back into the storage tank 10.

[0052] When it is necessary to discharge the liquid nitrogen inside the Dewar 20, the gas is delivered to the Dewar 20 through the air valve 32, the multi-way valve 34, the first branch pipe 35 and the second branch pipe 36. The one-way valve 38 also ensures that the gas can only flow in the above-mentioned discharge direction.

[0053] Therefore, the one-way valve 38 prevents backflow of liquid nitrogen or gas in the pipeline, thereby maintaining the stability and reliability of the Dewar liquid nitrogen control system. Specifically, by preventing backflow of liquid nitrogen or gas, the one-way valve 38 reduces the risk of safety accidents that may be caused by backflow, such as liquid nitrogen leakage or pipeline rupture. Moreover, the one-way valve 38 can prevent pressure surges or fluid erosion caused by backflow, thereby protecting other components in the Dewar liquid nitrogen control system from damage.

[0054] According to some embodiments of the present invention, each Dewar 20 is provided with a drain valve 21, which is suitable for connecting or isolating the interior of the corresponding Dewar 20 from the external environment.

[0055] Understandably, when the drain valve 21 is closed, the interior of the Dewar 20 is isolated from the external environment, preventing liquid nitrogen from leaking into the external environment and also preventing external air or other substances from entering the Dewar 20. When the drain valve 21 is open, the interior of the Dewar 20 is connected to the external environment, allowing liquid nitrogen to be discharged from the Dewar 20 into the external environment.

[0056] Therefore, when closed, the drain valve 21 isolates the Dewar 20 from the external environment, preventing external factors from damaging the Dewar 20 and other components of the Dewar liquid nitrogen control system. During vehicle maintenance or repair, the liquid nitrogen inside the Dewar 20 can be drained by opening the drain valve 21, facilitating vehicle maintenance by personnel.

[0057] According to some embodiments of the present invention, each Dewar 20 is provided with a pressure sensor 22, which is adapted to detect the gas pressure inside the corresponding Dewar 20.

[0058] In some embodiments, each Dewar 20 is provided with a pressure sensor 22, which detects the amount of liquid nitrogen in the Dewar 20 by detecting the gas pressure inside the Dewar 20.

[0059] Specifically, the gas law is PV = nRT, where P is pressure, V is gas volume, n is the amount of substance, R is the universal gas constant, and T is thermodynamic temperature. In the relatively closed system of Dewar 20, the temperature T of the gas phase space inside Dewar 20 is relatively stable (the excellent insulation of Dewar 20 ensures slow temperature changes), the volume V of the gas phase space in Dewar 20 is fixed (Dewar 20 has a rigid structure), and R is a constant. Therefore, the gas phase pressure P inside Dewar 20 is directly proportional to the amount of nitrogen in the gas phase, n.

[0060] Inside the Dewar 20, liquid nitrogen is in a state of equilibrium at low temperature and normal pressure. Some of the liquid nitrogen will vaporize into nitrogen gas and exist in the gas phase space at the top of the Dewar 20. As the liquid nitrogen is continuously consumed (due to natural volatilization caused by heat transfer), the amount of liquid nitrogen vaporized increases, and the amount of nitrogen gas n in the gas phase space increases. According to the above gas state equation relationship, the gas phase pressure P will increase accordingly.

[0061] Compared to traditional temperature or liquid level sensors placed inside a Dewar, the temperature sensor is almost ineffective because the internal temperature of the Dewar is around -196°C. As for the liquid level sensor, the internal space of the Dewar is small, and due to the acceleration and deceleration of the vehicle during operation, the liquid level inside the Dewar often fluctuates, making the liquid level sensor almost ineffective as well.

[0062] Therefore, this application, by installing a pressure sensor 22 inside the Dewar 20, can reliably detect the amount of liquid nitrogen in the Dewar 20, enabling timely replenishment when the amount of liquid nitrogen in the Dewar 20 is insufficient, thereby ensuring the normal and safe operation of the vehicle. In other words, this application innovatively uses a pressure sensor 22 to monitor the liquid nitrogen level inside the Dewar 20, solving the problem of inaccurate monitoring of the liquid nitrogen level inside the Dewar 20 under complex operating conditions during vehicle operation.

[0063] Preferably, this application can establish a pre-established relationship between the pressure inside the Dewar 20 and the liquid nitrogen consumption through experiments or theoretical calculations. After the Dewar 20 is newly filled with liquid nitrogen and reaches thermal equilibrium, the pressure P0 and the initial amount of liquid nitrogen m0 are recorded. As time progresses, when the pressure changes to P1, the liquid nitrogen consumption Δm is calculated using the established relationship based on the pressure change ΔP = P1 - P0.

[0064] By conducting multiple filling, settling, pressure measurement, and corresponding liquid nitrogen weight changes on a specific Dewar 20, an empirical formula or curve for pressure and liquid nitrogen consumption is fitted, so as to monitor the pressure in real time to estimate the liquid nitrogen consumption.

[0065] According to some embodiments of the present invention, a liquid level sensor 11 is provided inside the liquid storage tank 10. The liquid level sensor 11 is adapted to detect the liquid nitrogen level inside the liquid storage tank 10. The Dewar liquid nitrogen control system also includes a control component 40. The control component 40 is communicatively connected to the liquid level sensor 11, the pipeline assembly, and a plurality of pressure sensors 22. The control component 40 is adapted to control the operation of the pipeline assembly according to the liquid level sensor 11 and the plurality of pressure sensors 22, so that the pipeline assembly can selectively connect or disconnect the liquid storage tank 10 from the Dewar 20.

[0066] In some embodiments, the bottom of the liquid storage tank 10 is connected to a main pipe 31, the free end of the main pipe 31 is connected to an air valve 32, the bottom of the air valve 32 is connected to a multi-way valve 34, and the air valve 32 can be selectively connected to a gas storage device. The multi-way valve 34 is connected to two first branch pipes 35, which are located on opposite sides of the multi-way valve 34. Each first branch pipe 35 is connected to a plurality of second branch pipes 36, and each second branch pipe 36 is connected to a corresponding Dewar 20.

[0067] The main pipe 31 is equipped with a main valve 33, which can selectively open or close the main pipe 31. Each second branch pipe 36 is equipped with a branch valve 37 and a check valve 38, and the branch valve 37 can selectively open or close the corresponding second branch pipe 36. Of course, the liquid storage tank 10 can be selectively connected to at least one Dewar 20.

[0068] The control component 40 is communicatively connected to the liquid level sensor 11, the pressure sensor 22, the main valve 33, the air valve 32, the multi-way valve 34, and the branch valve 37. The liquid level sensor 11 can detect the liquid nitrogen level in the storage tank 10, thereby detecting the amount of liquid nitrogen in the storage tank 10. The pressure sensor 22 can detect the amount of liquid nitrogen in the corresponding Dewar 20.

[0069] When the liquid nitrogen in the storage tank 10 is insufficient and the vehicle is not in operation, the control component 40 can control the main valve 33 to close. At this time, the storage tank 10 is not connected to all the Dewar 20s, and the staff can add liquid nitrogen to the storage tank 10.

[0070] When the vehicle is under maintenance, the control unit 40 can control the main valve 33 to close, the air valve 32 to connect with the gas storage device, all the multiple ports of the multi-way valve 34 to connect, and all the branch valves 37 to open, so that the gas in the gas storage device can enter each Dewar 20 to help the liquid nitrogen in the Dewar 20 to be discharged.

[0071] When the vehicle is in operation and the liquid nitrogen in a certain Dewar 20 is insufficient, the control component 40 can connect the liquid storage tank 10 to the corresponding Dewar 20 to replenish the liquid nitrogen in the Dewar 20, thereby ensuring the normal operation of the vehicle.

[0072] Of course, the control component 40 can also issue an alarm when a valve malfunctions, a Dewar 20 malfunctions, a pressure sensor 22 malfunctions, or a level sensor 11 malfunctions, to remind staff to perform maintenance.

[0073] It is worth mentioning that the liquid level sensor 11 is installed inside the storage tank 10 to monitor the liquid nitrogen level in the storage tank 10 in real time, i.e., the total amount of liquid nitrogen in the storage tank 10. The liquid level sensor 11 transmits the liquid level data to the control component 40 so that the Dewar liquid nitrogen control system can understand the changes in the liquid nitrogen reserve and total consumption rate in the storage tank 10, thereby determining the overall working status of the Dewar 20 and rationally arranging the replenishment operation of each Dewar 20 to ensure that there is always enough liquid nitrogen in the storage tank 10 to meet the demand.

[0074] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. 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.

[0075] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A Dewar liquid nitrogen control system for high-temperature superconducting magnetic levitation vehicles, characterized in that, include: A liquid storage tank (10) is adapted to store liquid nitrogen and be connected to a vehicle; Dewar (20), wherein multiple Dewar (20) are constructed to be connected to the vehicle, and the vehicle is levitated by the multiple Dewar (20) in conjunction with the permanent magnet track; A piping assembly adapted to connect the liquid storage tank (10) to a plurality of the Dewars (20); wherein The piping assembly may be optionally connected to a gas storage device to accelerate the discharge of liquid nitrogen from the multiple Dewars (20) during vehicle maintenance; in The piping assembly includes a main pipe (31), one end of which is connected to the liquid storage tank (10), and the other end of which is connected to an air valve (32), which is optionally connected to a gas storage device and is adapted to connect the main pipe (31) to a plurality of Dewars (20). The piping assembly also includes a main valve (33) disposed on the main pipe (31) and adapted to open or close the main pipe (31); The piping assembly also includes a multi-way valve (34) having multiple ports. The multi-way valve (34) can selectively connect at least two of the ports, one of which is connected to the air valve (32), and the remaining ports are connected to first branch pipes (35), and the multiple first branch pipes (35) are connected to multiple Dewars (20). The piping assembly also includes a plurality of second branch pipes (36) corresponding one-to-one with the Dewar (20), the plurality of second branch pipes (36) being connected to the Dewar (20) respectively, and the first branch pipe (35) being connected to at least one second branch pipe (36).

2. The Dewar liquid nitrogen control system for high-temperature superconducting magnetic levitation vehicles according to claim 1, characterized in that, The piping assembly also includes a plurality of branch valves (37) corresponding one-to-one with the second branch pipe (36), wherein the branch valves (37) can selectively open or close the corresponding second branch pipe (36).

3. The Dewar liquid nitrogen control system for high-temperature superconducting magnetic levitation vehicles according to claim 1, characterized in that, The pipeline assembly also includes a plurality of one-way valves (38), which correspond one-to-one with and are connected to a plurality of second branch pipes (36).

4. The Dewar liquid nitrogen control system for high-temperature superconducting magnetic levitation vehicles according to claim 1, characterized in that, Each of the Dewars (20) is provided with a drain valve (21) which is adapted to connect or isolate the interior of the corresponding Dewar (20) from the external environment.

5. The Dewar liquid nitrogen control system for high-temperature superconducting magnetic levitation vehicles according to claim 1, characterized in that, Each of the Dewars (20) is provided with a pressure sensor (22) which is adapted to detect the gas pressure inside the corresponding Dewar (20).

6. The Dewar liquid nitrogen control system for high-temperature superconducting magnetic levitation vehicles according to claim 5, characterized in that, The liquid storage tank (10) is equipped with a liquid level sensor (11), which is adapted to detect the liquid nitrogen level in the liquid storage tank (10). The Dewar (20) liquid nitrogen control system also includes a control component (40), which is communicatively connected to the liquid level sensor (11), the pipeline assembly and a plurality of pressure sensors (22). The control component (40) is adapted to control the pipeline assembly to work according to the liquid level sensor (11) and the plurality of pressure sensors (22), so that the pipeline assembly can selectively connect or close the liquid storage tank (10) and the Dewar (20).

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