Superconducting bulk cooling apparatus and cooling method for high-temperature superconducting magnetic levitation vehicle

A superconducting bulk cooling method for a high-temperature superconducting magnetic levitation vehicle, comprising the following steps:

• S1, placing high-temperature superconducting bulks into a Dewar tank;
• S2, connecting a vacuum pump with a first vacuum pipe, opening a first stop valve at the same time, vacuumizing a vacuum box through the vacuum pump, stopping relevant operations after the vacuum degree is qualified through the detection with the vacuum gauge, and closing the first stop valve;
• S3, connecting the vacuum pump with a second vacuum pipe, opening a second stop valve at the same time, vacuumizing a condensing tank, a nitrogen siphon pipe and a liquid nitrogen return pipe through the vacuum pump, and closing the second stop valve after finishing the operation;
• S4, starting a refrigerating machine, reducing the internal temperature of the condensing tank through the refrigerating machine, and detecting the temperature through a temperature sensor to ensure that the temperature in the tank is stabilized at a nitrogen liquefied temperature;
• pumping saturated nitrogen generated by the phase change in a cooling process of the superconducting bulk into the condensing tank through a siphon effect, condensing the nitrogen into liquid nitrogen, and returning the liquid nitrogen into the Dewar tank through the liquid nitrogen return pipe to replenish the liquid nitrogen for cooling.