一、前言金属“O”形环密封广泛运用于军工和原子能工业设备。在国外,表面镀银的金属“O”形坏已应用于大直径原子能发电设备,封口直径达φ8500mm甚至更大。在国内有关部门也有应用,甚至已在化肥工业中的高压设备封口上试用,因此在我国也有初步使用经验。多年来,一些研究单位与工厂,已经开始了这方面的试验研究,从理论上探讨金属“O” I. Introduction Metal “O” ring seal is widely used in military and atomic energy industrial equipment. Abroad, the surface of the silver-plated metal “O” shape has been applied to large-diameter nuclear power generation equipment, sealing diameter of φ8500mm or more. Relevant departments in the country also have applications, and even high-pressure equipment in the fertilizer industry sealed the trial, so there are also initial experience in our country. Over the years, some research institutes and factories have already started the experimental research in this field, and theoretically discussed the metal “O”