| 摘要 |
PURPOSE:To reduce the performance of the refrigerating device and to obtain the compact and light weight device, in a helium refrigerating apparatus employed in superconductive magnetic floating type railroad rolling stocks and the like, by providing heat exchangers which are used for vacuum heat insulation in a container, and cooling high pressure helium gas for refrigeration. CONSTITUTION:A container 2 is provided in th container 1 wherein the vacuum heat insulation is provided. Liquid nitrogen and the like are flowed in a piping 3 which is provided in th container 2 and the container is cooled to a constant low temperature. A container 5 wherein liquid helium 4 is stored is provided in the container 3. In the conainer 1, a heat exchanger 14 to which refrigerant is supplied via a refrigerating device having a stages 8a and 8b and a piping 15 is provided. High pressure helium gas for refrigeration is outputted from a heat exchanger 14, and sequentially cooled through a heat exchanger 12, a cooler 10, and a heat exchanger 11. The gas is further cooled to the extremely low temperature at a JT expanding valve 7, and liquified in a condensation heat exchanger 6. The pressure reduced helium gas is returned to an external condensor through the exchangers 12 and 13, wherein heat exchange is performed with the high pressure helium gas. |
