| 摘要 |
To surely maintain sealing performance of a pressure vessel including a bottomed cylindrical vessel body with an opening end part and a cover body closing the opening end part. In this seal structure of the pressure vessel, annular grooves (11a, 11b) and ridges (21a, 21b) fitted to each other are formed on both of the inner and outer sides at the joining faces of opening end part (11) of the vessel body (10) and the cover body (20), and an annular vent hole (30) is formed between the inner ridge (21a) and the outer ridge (21b). An air supply hole (31) for supplying an inert gas to the vent hole (30) is formed in the cover body (20). The joining faces on the inside of the inner groove (11a) and inner ridge (21a) are in metal-to-metal contact. Furthermore, gaskets (51a, 51b) are held between the ridges (21a, 21b) and the grooves (11a, 11b). |
