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    • 8. 发明授权
    • Superconductive magnet including a cryocooler coldhead
    • 超导磁体包括一个低温冷却器
    • US07170377B2
    • 2007-01-30
    • US10710682
    • 2004-07-28
    • Longzhi JiangGregory Alan LehmannEdwin Lawrence Legall
    • Longzhi JiangGregory Alan LehmannEdwin Lawrence Legall
    • F25B19/00H01F5/00
    • H01F6/04F25B9/14F25B2400/17F25D19/006G01R33/3815
    • A zero boiloff cryogen cooled recondensing superconducting magnet assembly including superconducting magnet coils suitable for magnetic resonance imaging including a cryogen pressure vessel to contain a liquid cryogen reservoir to provide cryogenic temperatures to the magnet coils for superconducting operation; a vacuum vessel surrounding the pressure vessel and spaced therefrom; a first thermal shield surrounding and spaced from the pressure vessel; a second thermal shield surrounding and spaced from the first thermal shield and intermediate the vacuum vessel and the first shield; a cryocooler thermally connected by a first and a second thermal interface to the first and second thermal shields, respectively; a recondenser positioned in the space between the pressure vessel and the first thermal shield and thermally connected by a thermal interface to the cryocooler to recondense, back to liquid, cryogen gas provided from the pressure vessel; and means for returning the recondensed liquid cryogen the pressure vessel; wherein the second thermal shield surrounding the first thermal shield reduces a radiation heat load from the first thermal shield to the pressure vessel lowering boiloff of cryogen gas under conditions of failure or power off of the cryocooler.
    • 一种零沸腾冷冻再冷凝超导磁体组件,包括适用于磁共振成像的超导磁体线圈,包括冷冻剂压力容器,以容纳液体冷冻剂储存器,以向超导体操作的磁体线圈提供低温; 围绕压力容器并与之隔开的真空容器; 围绕并与压力容器隔开的第一热屏蔽; 围绕第一热屏蔽并与真空容器和第一屏蔽件间隔开的第二热屏蔽; 分别通过第一和第二热界面热连接到第一和第二热屏蔽的低温冷却器; 再冷凝器定位在压力容器和第一热屏蔽之间的空间中,并通过热界面与低温冷却器热连接以重新冷凝,从压力容器提供的液体冷冻剂气体; 以及用于使所述再冷凝液体冷冻剂返回所述压力容器的装置; 其中围绕所述第一热屏蔽的所述第二热屏蔽减少从所述第一热屏蔽到所述压力容器的辐射热负荷,以在所述低温冷却器的故障或断电的条件下降低制冷剂气体的沸腾。