A Study on the Structure of Liquid Hydrogen Pump

Abstract

To keep a good storage efficiency of a liquid hydrogen, a reciprocating liquid hydrogen pump has to have a long and slender structure to eliminate the heat transferred from the outside of the tank into the liquid hydrogen in the tank. Because of the structure, it is quite difficult to align the both center axes of the piston and cylinder. Therefore, the pump is subject to having a large clearance between the piston and the cylinder resulting in a large amount of leakage of liquid hydrogen. To solve the problem, a self -alignment structure has been applied to the pump and a good performace has been obtained.