High-temperature superconducting motor rotor low-temperature cooling system utilizing liquid hydrogen

Abstract

The invention discloses a high-temperature superconducting motor rotor low-temperature cooling system utilizing liquid hydrogen, and relates to the technical field of superconducting application low temperature. In the system, liquid hydrogen is stored in a liquid hydrogen storage tank to form a liquid section at the bottom and a gas section at the top, the liquid hydrogen of the liquid section istransmitted to a liquid hydrogen gasification cavity in an outer wall containing cavity of a high-temperature superconducting motor rotor in a communicating mode through a liquid hydrogen conveying pipe under the action of gravity to be subjected to heat exchange so as to achieve cooling, and hydrogen formed after liquid hydrogen gasification is transmitted back to the gas section of the liquid hydrogen storage tank through a hydrogen conveying pipeline to maintain the pressure in the liquid hydrogen storage tank so as to form a closed cycle. According to the system, liquid hydrogen is used as a low-temperature cooling medium so as to effectively maintain the temperature in the liquid hydrogen gasification cavity and meet the working temperature requirement of the superconducting magnet,and the system is driven by gravity, so that a circulating pump does not need to be additionally used, and the reliability of the system is improved.

Description

technical field [0001] The invention relates to the field of low-temperature technology for superconducting applications, in particular to a high-temperature superconducting motor rotor low-temperature cooling system using liquid hydrogen. Background technique [0002] Since the discovery of high-temperature superconducting materials in 1986, high-temperature superconducting materials have developed rapidly and have attracted the follow-up development of many countries in the world. The development and application fields of superconducting wires are becoming more and more extensive, such as superconducting current limiters and superconducting cables. , superconducting motors, superconducting magnetic energy storage, etc. At present, the high-temperature superconducting wires that have been commercially operated mainly include the first-generation Bi-series superconducting wires and the second-generation Yi-series high-temperature superconducting wires. The working temperatu...

AI Technical Summary

Problems solved by technology

However, due to the heat leakage of the cryogenic container itself and the conduction heat of the current lead, it is necessary to continuously replenish liquid nitrogen, and the working temperature of the magnet is around 70K, which cannot meet the requirement of 30K temperature.

[0005] 2. Direct conduction cooling of superconducting magnets through cryogenic refrigerators. This method is simple and direct, but it cannot be applied to rotating superconducting motor rotors, especially when the linear velocity is high.

[0006] 3. Adopt cold helium forced convection method. This method uses cold helium as the intermediate cooling medium and uses helium pump as the circulation power. However, the operating pressure of this method is high and the system is complex, and the cost of the helium pump is relatively high.

Images