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对于所有生产食品和医药的机器设备,绝不允许油液外泄漏。在所有的设计、加工及工作参数符合规定要求的倩况下,O形圈实际上并非在所有的使用条件下均能保证没有泄漏。图1所示为O形圈的安装沟槽或沉孔,O形圈受到预挤压后,在承受压力的一侧产生镰刀形空腔(状态Ⅰ)。当工作压力升高时,O形圈被向外推,使这个镰刀形空腔体积减小(状态Ⅱ)。只要工作压力不低于O形圈的变形阻力,O形圈仍保持变形状态。在这种工作状态下,不会产生外泄漏。当工作压力不大于
For all machinery and equipment for the production of foodstuffs and pharmaceuticals, never allow oil to leak outside. In all cases where design, processing and operating parameters meet regulatory requirements, the O-ring is not in fact guaranteed to be leak free under all conditions of use. Figure 1 shows the mounting groove or counterbore of the O-ring. After the O-ring has been pre-extruded, a sickle-shaped cavity is created on the pressure-bearing side (State I). As the working pressure increases, the O-ring is pushed outward, reducing the size of this sickle-shaped cavity (State II). As long as the working pressure is not lower than the O-ring deformation resistance, the O-ring remains deformed. In this working condition, no external leakage will occur. When the work pressure is not greater than