4WRZ10E1-50-7X/6EG24N9K4/M力士乐

4WRZ10E1-50-7X/6EG24N9K4/M力士乐

4WRZ10E1-50-7X/6EG24N9K4/M

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4WRZ10E1-50-7X/6EG24N9K4/M

在液压转动、气动元件与系统中，往复动密封是一种常见的密封要求。动力缸活塞与缸体、活塞干预缸盖以及各类滑阀上都用到往复运动密封。缝隙由圆柱杆与圆柱孔形成，杆在圆柱孔内轴向运动。密封作用限制流体的轴向泄漏。

用作往复运动密封时，O形圈的预密封效果和自密封作用与静密封一样，并且由于O形圈自身的弹力，而具有磨损后自动补偿的能力。但由于液体介质密封时，由于杆运动速度、液体的压力、粘度的作用，情况比静密封复杂。

当液体在压力作用下，液体分子与金属表面互相作用，油液中所含的―极性分子在金属表面上紧密而整齐的排列，沿滑移面与密封件间形成一个强固的边界层油膜，并且对滑移面产生的附着力。该液体薄膜始终存在于密封件与往复运动面之间，它亦起一定的密封作用，并且对运动密封面的润滑是非常重要的。
力士乐 比例阀 武汉现货
但是对泄漏来讲是有害的。但往复运动的轴向外拖出时，轴上的液体薄膜便与轴一起拉出，由于密封件的―擦拭作用，当往复运动的轴缩回时，该液体薄膜便被密封元件阻留在外面。随着往复运动行程次数增多，阻留在外面的液体就越多，后形成油滴，这就是往复运动式密封装置的泄漏。由于液压油的粘度随着温度的升高而降低，油膜厚度相应减小，所以液压设备在低温下启动时，运动开始时的泄漏较大，随着运动过程中因各种损失引起温度升高，泄漏量有逐渐降低的趋势。O形圈作为往复式密封，结构紧凑、尺寸小，可以降低元件价格。主要用在:

4WRZ10E1-50-7X/6EG24N9K4/M