Fluid handling device for liquid hydrogen

Abstract

An object is to propose a fluid handling device for liquid hydrogen that prevents evaporation of liquid hydrogen, and moreover affords excellent heat insulation without liquefying oxygen in the vicinity. In a fluid handling device for liquid hydrogen, piping sections () have a heat insulation structure, a swivel joint section () is configured with helium gas sealed into a boundary relative-rotation section () between an outer ring section () and an inner ring section () with a bearing section () interposed, and moreover, between an outside-air-contacting wall section () that is in contact with the outside air and a liquid-hydrogen-contacting wall section () that is in contact with liquid hydrogen, a vacuum section () extends in the axial direction and moreover a heat-conducting extended path section () is provided with one end connected to the outside-air-contacting wall section () and the other end connected to the liquid-hydrogen-contacting wall section (), extending the heat conduction distance between the outside-air-contacting wall section () and the liquid-hydrogen-contacting wall section (), and reducing heat conductivity between the outside-air-contacting wall section () and the liquid-hydrogen-contacting wall section ().