PURPOSE: To shorten extracting part and facilitate operation and handling by providing a vacuum heat insulating tube in an ultra-low temperature change-gas storage tank, making an inner pipe part in which an ultra-low temperature liquefied gas directly flows separable and connectable.
CONSTITUTION: The space between an outer pipe 1 and an inner pipe 2 in which LH2 flows forms a vacuum heat insulating layer 3, and they are connected to a Dewar vessel through an insert 4 and to a cryostat in which LH2 is used through an insert part 5. LH2 is carried from the Dewar vessel to the cryostat. The Dewar vessel has the vacuum heat insulating layer 3 between its outer tank 11 and inner tank 12 and a liquid extracting part formed into a long neck, and the temperature of the Dewar vessel upper part is close to a room temperature, and the lower side of the Dewar vessel neck part is close to a ultra-low temperature. The vacuum heat insulating part of the Dewar vessel side insert part of TRT is divided, and a vacuum heat insulating tube 6 is inserted to the Dewar vessel. The insert part 4 has a length similar to that of a general bayonet, and the inner pipe 2 can be separated from and connected to a liquid extracting inner pipe 2 through a connecting part 8.
MORITA SHOJI
MATSUMOTO KOZO
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