SUPERCONDUCTING MAGNETIC SUSPENSION DEVICE HAVING NO LIQUID HELIUM VOLATILIZATION

摘要

A free liquid helium volatilization superconductive magnetic suspension device includes a low temperature container, a refrigeration, a cold screen, a liquid helium container, a superconductive rotor, a suspension coil, a rotor chamber, a liquid tube, a condenser and a pole-axis displacement sensor. The heat generated by the wires of the suspension coil can be prevented transferring to the liquid helium container by the room temperature current lead joint, the high temperature superconducting current lead joint and low temperature superconducting current lead joint. Therefore the volatilization of the liquid helium in the liquid helium container can be reduced. The status of free liquid helium volatilization in the liquid helium container can be reached through refrigeration cooling condenser to liquefy the helium. The device needs not to be input the liquid helium time after time and can run independently for a long term.

主权项

1. A superconducting magnetic suspension device having no substantial liquid helium volatilization, comprising: a low temperature container, a refrigerator, and a cold screen, wherein the refrigerator is mounted above the low temperature container, and the cylindrical cold screen is fixed under a primary cooling head of the refrigerator, wherein:
the superconducting magnetic suspension device further comprises a liquid helium container, a superconducting rotor, suspension coils, a rotor chamber, a liquid tube, a room temperature current lead joint, a high temperature superconducting current lead joint, a low temperature superconducting current lead joint, a condenser, and a pole-axis displacement sensor; the liquid helium container is placed in the cold screen and is fixed under a secondary cooling head of the refrigerator; the liquid tube is mounted above the liquid helium container with a lower end of the liquid tube extending into the liquid helium container; the superconducting rotor is arranged in the rotor chamber, and the suspension coils are arranged on the upper and lower ends within the rotor chamber; the pole-axis displacement sensor is placed at a center position on the top of the superconducting rotor within the rotor chamber, a probe of the pole-axis displacement sensor pointing downwards to a top plane of the superconducting rotor; the rotor chamber is held at the center of the liquid helium container by a pull rod; the condenser is placed at a center position above the rotor chamber in the interior of the liquid helium container; the room temperature current lead joint is mounted on the top surface of the low temperature container; a lead on an upper side of the room temperature current lead joint is connected to a power source and a lead on an lower side of the room temperature current lead joint is connected to a lead on an upper side of the high temperature superconducting current lead joint; the high temperature superconducting current lead joint is mounted on the top surface of the cold screen and is cooled by the cold screen, so that the current lead of the high temperature superconducting current lead joint is in a superconducting state; a lead on a lower side of the high temperature superconducting current lead joint is connected to a lead on an upper side of the low temperature superconducting current lead joint, the low temperature superconducting current lead joint is mounted on an upper cover of the liquid helium container; the low temperature superconducting current lead joint is cooled by the liquid helium container, so that the current lead of the low temperature superconducting current lead joint is in a superconducting state; a lead on a lower side of the low temperature superconducting current lead joint is connected to the suspension coils.