Superconducting eddy-current brake for high- speed train

Patent metadata

Field	Value
Publication number	US-11904729-B2
Application number	US-202017030274-A
Country	US
Kind code	B2
Filing date	Sep 23, 2020
Priority date	Jul 23, 2018
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

A superconducting eddy-current brake for high-speed trains includes a pair of superconducting magnet units with alternate arrangement of N and S poles; and a cryogenic system. The superconducting magnet units are fixed on a bottom of a bogie of the train and an air gap is provided between the superconducting magnet units and a top surface of a rail below the bogie. The cryogenic system is provided on the bogie of the train. Each superconducting magnet unit is embedded with a superconducting container including a coil case, a thermal shield and a Dewar successively from inside to outside. The coil case is filled with liquid helium. A superconducting coil is provided in the coil case and immersed in the liquid helium. A high-vacuum environment is provided in the thermal shield. Liquid nitrogen inlet and outlet pipes are provided on an outer wall of the thermal shield.

First claim

What is claimed is:

1. A superconducting eddy-current brake for a high-speed train, comprising a pair of superconducting magnet units with alternate arrangement of N and S poles, and a cryogenic system;
wherein the superconducting magnet units are fixed on a bottom of a bogie of the high-speed train; and an air gap is formed between the superconducting magnet units and a top surface of a guide rail below the bogie;
the cryogenic system is provided on the bogie of the high-speed train;
each of the superconducting magnet units comprises a superconducting container; wherein the superconducting container is embedded with a coil case, a thermal shield and a Dewar successively from inside to outside;
the coil case is filled with liquid helium; a liquid helium inlet and a liquid helium outlet are provided on the coil case; a superconducting coil is provided in the coil case and is immersed in the liquid helium; a coil terminal inlet and a coil terminal outlet are provided on the coil case;
the thermal shield has a vacuum environment therein; a liquid nitrogen inlet pipe and a liquid nitrogen outlet pipe are provided on an outer wall of the thermal shield; a liquid nitrogen inlet and a liquid nitrogen outlet respectively corresponding to the liquid nitrogen inlet pipe and the liquid nitrogen outlet pipe are provided on the thermal shield;
the cryogenic system comprises a liquid nitrogen storage tank and a liquid helium storage tank; an outlet of the liquid helium storage tank is connected with the liquid helium inlet of the superconducting container of each of the superconducting magnet units; and an outlet of the liquid nitrogen storage tank is connected with the liquid nitrogen inlet of the superconducting container for each of the superconducting magnet units.

2. The superconducting eddy-current brake of claim 1 , wherein an inner pipe integrated with the thermal shield and an outer pipe integrated with the Dewar are provided at both sides of the superconducting container, respectively; the outer pipe is correspondingly sheathed outside the inner pipe; the both sides of the superconducting container are respectively provided with a lateral tie rod; the lateral tie rod comprises a first inner insulation block, a lateral spring, a first outer insulation block and a lateral force transmission rod; each of two side walls of the coil case is fixedly provided with the first inner insulation block; the lateral force transmission rod is fixedly provided in the corresponding inner pipe; an outer end of the lateral force transmission rod extends out of the corresponding inner pipe and is fixed at an end of the corresponding outer pipe; an inner end of the lateral force transmission rod is fixedly connected to the corresponding first outer insulation block; and the lateral spring is provided between the first inner insulation block and the first outer insulation block.

3. The superconducting eddy-current brake of claim 1 , wherein a vertical tie rod is provided on an upper part of the superconducting container; the vertical tie rod comprises a second inner insulation block, a vertical spring, a second outer insulation block and a vertical force transmission rod; a groove is provided on a top of the coil case; the second inner insulation block is fixed at a bottom of the groove; the vertical force transmission rod is longitudinally and fixedly sheathed at a top of the thermal shield; a top end of the vertical force transmission rod passes through the thermal shield and is fixed on the Dewar; a bottom end of the vertical force transmission rod is fixedly connected to the second outer insulation block; and the vertical spring is provided between the second inner insulation block and the second outer insulation block.

4. The superconducting eddy-current brake of claim 2 , wherein a vertical tie rod is provided on an upper part of the superconducting container; the vertical tie rod comprises a second inner insulation block, a vertical spring, a second outer insulation block and a vertical force transmission rod; a groove is provided on a top of the coil case; the second inner insulation block is fixed at a bottom of the groove; the vertical force transmission rod is longitudinally and fixedly sheathed at a top of the thermal shield; a top end of the vertical force transmission rod passes through the thermal shield and is fixed on the Dewar; a bottom end of the vertical force transmission rod is fixedly connected to the second outer insulation block; and the vertical spring is provided between the second inner insulation block and the second outer insulation block.

5. The superconducting eddy-current brake of claim 1 , wherein the superconducting coil is fixed in the coil case through a limit block.

6. The superconducting eddy-current brake of claim 1 , wherein a liquid-level gauge and a temperature sensor are provided in the coil case.

7. The superconducting eddy-current brake of claim 1 , wherein the air gap between the superconducting magnet units and the top surface of the guide rail is 5-30 mm.

8. The superconducting eddy-current brake of claim 1 , wherein a liquid level of the liquid helium exceeds a height of the corresponding superconducting coil by at least more than 0.5 times the height of the corresponding superconducting coil.

9. The superconducting eddy-current brake of claim 1 , wherein the superconducting coil is oval-shaped.

10. The superconducting eddy-current brake of claim 3 , wherein four vertical tie rods are evenly distributed on an upper part of the superconducting container.

11. The superconducting eddy current brake of claim 4 , wherein four vertical tie rods are evenly distributed on an upper part of the superconducting container.

Assignees

• Hefei Inst Physical Sci Cas

Inventors

• Fang Chao
• Wei Jing
• Song Yuntao
• Dai Wenhua
• Zheng Jinxing

Classifications

• B60L7/28 Primary

  Eddy-current braking · CPC title

• B60L13/04

  Magnetic suspension or levitation for vehicles · CPC title

• B60L13/10

  Combination of electric propulsion and magnetic suspension or levitation · CPC title

• H02K49/02 Primary

  of the asynchronous induction type · CPC title

• B60L2200/26

  Rail vehicles · CPC title