Cryostat device for superconducting magnetic levitation train and operation method thereof
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Solution Overview
Problem
Existing superconducting magnetic levitation train cryostat devices require frequent liquid nitrogen replenishment, leading to reduced train operation efficiency and limited levitation performance of the superconducting bulk.
Innovation Solution
A cryostat device with a conduction assembly, support assembly, and refrigeration assembly, where the conduction assembly includes a copper box with a superconducting bulk accommodating cavity and a thermally-conductive support rod assembly, and the refrigeration assembly provides cooling energy to maintain a low temperature environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If liquid nitrogen bath cooling is used, then the superconducting bulk can be cooled to operating temperature, but frequent liquid nitrogen replenishment is required which reduces train operation efficiency
Solution Approach 1:
The patent replaces the liquid nitrogen bath cooling system with a solid-state conduction cooling system using a cryostat device. The cryostat maintains the superconducting bulk at operating temperature through thermal conduction from external refrigeration equipment, eliminating the need for frequent liquid nitrogen replenishment and thereby improving train operation efficiency.
Solution Approach 2:
The patent introduces a cryostat device as an intermediary between the external environment and the superconducting bulk. The cryostat acts as a thermal management system that conducts heat away from the superconducting bulk through its walls, maintaining the required low temperature without direct contact with liquid nitrogen, thus avoiding the operational interruptions associated with liquid replenishment.
2Temperature
If liquid nitrogen bath cooling is used, then cooling is provided to the superconducting bulk, but the levitation performance is limited
Solution Approach 1:
The patent enables precise control of the superconducting bulk temperature by adjusting the cooling parameters of the cryostat system. By optimizing the thermal conduction path and refrigeration power, the system can maintain the superconducting bulk at the optimal temperature for maximum levitation performance, overcoming the limitations of fixed-temperature liquid nitrogen cooling.
3Temperature
If conventional cryostat structure is used, then cooling function is provided, but heat leakage occurs and maintenance costs are high
Solution Approach 1:
The patent employs a cryostat with composite wall structure that combines materials with different thermal properties. The cryostat walls are designed with thermal insulation layers and heat reflection layers to minimize heat conduction and radiation from the external environment, thereby reducing heat leakage into the cooling chamber and improving the efficiency of the refrigeration system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cryostat device reduces heat leakage and maintenance costs, allows for lower operating temperatures than liquid nitrogen, and enhances the levitation performance of the superconducting bulk, ensuring long-term stable operation of the magnetic levitation train.
Implementation Method 1
a thermally-conductive support rod assembly; a top of the thermally-conductive support rod assembly is fixedly connected with a bottom of the copper box, and a bottom of the thermally-conductive support rod assembly is fixedly connected with a bottom wall of the conduction shell
Implementation Method 2
the refrigeration assembly is provided with a cooling energy input end, and the cooling energy input end is connected with the cooling energy connecting end
Implementation Method 3
an on-board superconducting bulk is mounted in a cryostat device
Implementation Method 4
the copper box is arranged in the conduction shell; a top of the thermally-conductive support rod assembly is fixedly connected with a bottom of the copper box
Data Source
AI summary
A cryostat device for a superconducting magnetic levitation train includes a conduction assembly, a support assembly and a refrigeration assembly. The conduction assembly includes a conduction shell, a copper box arranged in the conduction shell, and a thermally-conductive support rod assembly. A top of the thermally-conductive support rod assembly is connected with a bottom of the copper box. A bottom of the thermally-conductive support rod assembly is connected with a bottom wall of the conduction shell. A top of the copper box is provided with a superconducting bulk accommodating cavity. The bottom of the copper box is provided with a cooling energy connecting end. A top of the support assembly is configured to support the conduction assembly. A bottom of the support assembly is connected with a bogie chassis. The refrigeration assembly is provided with a cooling energy input end connected with the cooling energy connecting end.