| 摘要 |
PURPOSE:To prevent a flooding phenomenon from occurring as well as to aim at improvements in cooling capacity ever so better, by forming a connecting pipe line between a vessel inside a panel in a vacuum vessel and a dewer into a double pipe structure, while separating a gaseous phase stream and a liquid phase stream of the present pump, which exhausts the inside of the vacuum vessel to a superhigh vacuum, to the full. CONSTITUTION:An updraft flowing from a vessel 7 inside a panel to a dewer 3 is being cooled in time of passing through liquid helium 6 whereby in time of passing through a connecting pipe line 10, its heat exchange with an outer surface of an inner tube 12 is almost nothing, and furthermore such an effect as seeding the inner pipe 12 from ambient radiant heat is secured. In consequence, a portion for evaporation of the liquid helium inside the inner pipe 12 is almost nothing there, whereby a circulating circuit of a liquid helium storage part 16 a liquid phase inflow port 13 the inner pipe 12 the panel inside vessel 7 a vapored position outlet 14 the connecting pipe line 10 a helium space 15 in an interval between the panel inside vessel 7 of a panel heat receiving plate 2 and the dewer 3 by the connecting pipe line 10 and the inner pipe 12, therefore no flooding happens there so that the state is stabilized and a loss of heat is very little whereby replenishment of the liquid helium and exhaust of vapored gas take place so smoothly, thus cooling capacity is improved. |
