Neck tube reinforcement structure of the low-temperature container

(57) Abstract: without breaking the vacuum of the Objective vacuum vessel, effectively performing reinforcement of necks extending from the inner container. [Configuration] necks 14a extends from the top wall 14c of the liquid helium tank housed in a vacuum container, the neck tube reinforcing structure in a cryostat 10 in which the flange portion 14b of the upper end is joined to the flange portion 21b of the vacuum container side. The top wall 1 The female screw member 50 is fixed to the rear surface of 4c, against the lid plate 54 on the flange portion 14b, it is connected by a connecting shaft 52 that is inserted both into the necks 14a. By the nut 56 is mounted, tightening it to the threaded portion 52b formed on the upper end of the connecting shaft 52, the female screw member 50 and the cover plate 54 Give the direction of the tensile force to approach both between and.