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O型橡胶密封圈
一、O形橡胶密封圈是一种断面形状为圆形的密封元件，它广泛用于多种机械设备中，在一定温度、压力及不同的液体或气体介质中起到密封作用，与其它密封圈相比，具有如下的优越性能：
①、密封部位结构简单，安装部位紧凑，而且重量较轻。
②、有自密封作用，往往只用一个密封件便能完成密封效果。
③、密封性能好，用作固定密封时几乎没有泄漏，用作运动密封时，只在速度较高时才有些泄漏。
④、运动摩擦阻力很小，对于压力交变的场合也能适应。
⑤、尺寸和沟槽已标准化，成本低，产品易得，便于使用和外购。
与其它密封圈相比，也存在下列三个问题：
①、起动时的摩擦阻力大。
②、用作气动装置的密封时，必须加润滑油，防止磨损。
③、对偶合配件，如运动面、沟槽、间隙等的加工尺寸及精度要求很严。
O形橡胶密封圈的结构设计原理
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