Reduction of blockages in a cryogenic refrigeration system such as for magnetic resonance imaging systems
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United States of America Patent
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Mar 9, 2021
Grant Date -
Jun 4, 2015
app pub date -
Apr 19, 2013
filing date -
Jun 20, 2012
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Abstract
A cryogenic refrigeration system is provided having particular application in cooling a Magnetic Resonance Imaging system. The cryogenic refrigeration system comprises a conduit arranged as a cooling circuit through which a coolant fluid is pumped, the conduit being in thermal communication with a least one cooled stage for cooling the coolant fluid to a first temperature, and wherein the conduit comprises a cryotrap in communication with the coolant fluid, the cryotrap being operable to remove contaminants from the coolant fluid by cryogenic pumping. The conduit further comprises a flow impedance for cooling the coolant fluid to a second temperature lower than the first temperature, and a hydrogen filter upstream of the flow impedance and in communication with the coolant fluid, the hydrogen filter being cooled to a temperature below the freezing point of hydrogen in the coolant fluid and operable to remove contaminant hydrogen from the coolant fluid.
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