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Superconducting magnet with thermal battery

A technology of superconducting magnets and thermal batteries, applied in superconducting magnets/coils, magnetic objects, circuits, etc., can solve the problems of affecting transportation time and high evaporation rate of liquid helium, and achieve extended maintenance, high-efficiency heat shielding, and easy transportation Effect

Inactive Publication Date: 2020-08-25
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this design is the high evaporation rate of liquid helium when the cold head is closed
This adversely affects the transit time (and thus distance) used to transport the magnet from the factory to the customer site

Method used

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  • Superconducting magnet with thermal battery
  • Superconducting magnet with thermal battery
  • Superconducting magnet with thermal battery

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Embodiment Construction

[0023] In embodiments disclosed herein, the thermal shield of the superconducting magnet includes a thermal battery that uses latent heat stored in nitrogen (or another working fluid such as hydrogen or dry air) to improve thermal performance. One or more phase changes (e.g., solid-to-liquid and / or liquid-to-gas) of the working fluid of the thermal battery operate to absorb heat during transport mode (or other times when the cold head is not operating to provide active cooling) part of the thermal load on the shield. During the phase transition, the temperature of the working fluid is maintained at a fixed temperature. For example, solid nitrogen melts to liquid nitrogen (LN) at approximately 63K, and thus remains at 63K because the melting process absorbs latent heat. Similarly, LN vaporizes to nitrogen at about 77K, and thus remains at 77K because the vaporization process absorbs latent heat. During the solid-liquid or liquid-gas phase transition, the temperature of the wo...

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Abstract

A superconducting magnet includes a vacuum vessel (20), a liquid helium vessel (14) disposed in the vacuum vessel, and superconducting magnet windings (12) disposed in the liquid helium vessel. A thermal shield (22, 24) is spaced apart from and at least partly surrounds the liquid helium vessel. A thermal battery (30) is disposed in the vacuum vessel and is in thermally conductive contact with thethermal shield. The thermal battery may comprise a sealed container (32) in thermally conductive contact with the thermal shield and containing a working fluid such as nitrogen, and may contain a porous material (34). In operation, when active cooling of the magnet is turned off, the thermal battery slows the warming of the magnet by way of absorption of latent heat by the working fluid undergoing a solid-to-liquid or liquid-to-gas phase change.

Description

technical field [0001] The following relates to the field of superconducting magnets, the field of magnetic resonance imaging (MRI), the field of thermal management, and related fields. Background technique [0002] In a typical superconducting magnet used in a magnetic resonance imaging (MRI) system, the superconducting windings are cooled by liquid helium (LHe) in an LHe vessel disposed inside a vacuum vessel. A heat shield sheet with high thermal conductivity is also provided inside the vacuum vessel to surround the LHe vessel. The LHe vessel is spaced from the walls of the heat shield, and in turn the heat shield is spaced from the walls of the vacuum vessel, such that heat transfer from the environment into the LHe vessel is inhibited because this heat must pass from the vacuum vessel wall to the heat shield. Inward radiation of the part and then transfer by further radiative transfer from the heat shield to the LHe vessel. The vacuum of the vacuum vessel prevents con...

Claims

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Application Information

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IPC IPC(8): H01F6/04
CPCH01F6/04A61B5/055G01R33/34023G01R33/3815H01F6/06
Inventor 胡泓
Owner KONINKLJIJKE PHILIPS NV
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