초록 ▼

Method and apparatus for preventing loss of liquid cryogen due to heat infiltration into the cryogen stored in a dewar. At least one transient heat shield disposed in the vacuum space between the inner and outer vessels of the dewar in heat exchange with normal vapor withdrawal means of the stored c

Method and apparatus for preventing loss of liquid cryogen due to heat infiltration into the cryogen stored in a dewar. At least one transient heat shield disposed in the vacuum space between the inner and outer vessels of the dewar in heat exchange with normal vapor withdrawal means of the stored cryogen intercepts heat transfer into the stored cryogen.

대표청구항 ▼

In a dewar for storing or transporting cryogenic fluid of the type containing an outer vessel and an inner vessel disposed therein, said inner vessel including means to admit and withdraw cryogenic fluid from the interior thereof, and insulation between said inner and outer vessels, the improvement

In a dewar for storing or transporting cryogenic fluid of the type containing an outer vessel and an inner vessel disposed therein, said inner vessel including means to admit and withdraw cryogenic fluid from the interior thereof, and insulation between said inner and outer vessels, the improvement comprising: disposing at least one metallic transient heat shield between said inner and outer vessels, said heat shield containing means to retain refrigeration, said means to retain refrigeration adapted to be contacted by cold vaporized cryogen as it is withdrawn from said inner vessel, said means to retain refrigeration also includes a heat sink in heat exchange with said vapor withdrawal means.