Patent ID: 7891196

Claim:
A mobile MRI system, comprising: a cryogenic unit housed in a mobile trailer; and an apparatus for venting evaporated coolant from the cryogenic unit housed in the mobile trailer, the apparatus including a quench line connected to receive a flow of evaporated coolant gas from said cryogenic unit during a quench thereof; a plenum coupled to said quench line and opening to an ambient environment surrounding said trailer via a main vent and a secondary vent; and first and second deflector plates mounted in said plenum; wherein said first and second deflector plates are stationary, substantially flat and together define a boundary between said main vent and said secondary vent; said first and second deflector plates cooperate with an upwardly extending upper interior surface of said plenum to guide said gas flow in an upward direction relative to a surface that supports the trailer, as said gas exits the plenum; said first and second deflector plates overlap each other and are separated by a gap that extends between said first and second deflector plates in an area of said overlap, said gap connecting said secondary vent with said main vent; and said first and second deflector plates are arranged so that an outward flow of evaporated gas from said cryogenic unit via said main vent causes ambient air to be drawn into the secondary vent, through the gap, and into the main vent where the ambient air is combined with said outward flow of evaporated gas.