A Helium Microcirculation Refrigerated Dewar System for Superconducting Magnets

Abstract

The invention discloses a helium microcirculation refrigeration Dewar system for superconducting magnets, which belongs to the technical field of cooling devices for superconducting magnets, and comprises: a Dewar with a concave heat conduction cavity on the outer surface of the Dewar; a coupling head , the coupling head extends into the heat conduction chamber, and one end of the coupling head is connected to the inner bottom wall of the heat conduction chamber; the superconducting coil is arranged in the Dewar; the helium microcirculation circuit is arranged in the Dewar, and the helium microcirculation circuit includes the condensation chamber and A plurality of heat exchange pipes, the condensation chamber is connected with the outer bottom wall of the heat conduction chamber, one end of the heat exchange pipe is connected with the condensation chamber, the other end of the heat exchange pipe is closed and connected with the superconducting coil, the heat exchange pipe and the condensation chamber are filled with Helium: the heat conduction chamber of the present invention is only connected to the atmosphere, not to the interior of the Dewar, so that a helium-enclosed operating volume space can be better constructed, and the helium is no longer subject to the diffusion and thermal shock of the atmosphere, and no freezing will occur phenomenon, ensuring heat transfer efficiency and avoiding failure of superconducting magnets.

Description

technical field [0001] The invention relates to the technical field of cooling devices for superconducting magnets, in particular to a helium microcirculation refrigeration Dewar system for superconducting magnets. Background technique [0002] The existing superconducting magnet structure usually consists of a superconducting coil, a liquid helium container, a room temperature end container, a thermal radiation shielding assembly for constructing a temperature gradient between the liquid helium container and the room temperature end container, and a suspension assembly for the liquid helium container. Generally, the closed space formed between the liquid helium container and the room temperature end container is in a high vacuum state, providing a heat-insulating environment for the liquid helium container. In order to provide optimum thermal insulation, liquid helium containers, thermal radiation shielding components and other necessary components are covered with a certai...

AI Technical Summary

Problems solved by technology

In actual operation, the site where superconducting magnets are used usually does not have the conditions for helium recovery, which will inevitably lead to waste of liquid helium

[0006] The liquid helium cavity of the superconducting magnet is connected to the atmospheric environment. When installing or replacing the refrigerator, convection between helium and the atmosphere will occur in the container space where the refrigerator is installed, resulting in volatilization loss of helium and damage to the low-temperature end wall of the container. Icing (mainly nitrogen ice), the icing area directly affects the heat transfer efficiency, and even leads to accidents

Moreover, if the superconducting magnet is quenched during use, the existing solutions can only let the helium volatilize and cannot be recycled

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