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2024-11-15
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O型圈是密封中最常用的一种密封件。但由于选用、沟槽设计、加工和装配上的不当，常常造成漏油故障，可谓是小件坏大事。
我国国家标准中关于O型圈尺寸的标准有GB1235-76、GB3452.1-88以及GB3452.1-92，其中GB1235-76规定的O型圈截面直径（又称线径）有1.9、2.4、3.1、3.5、5.7等，O型圈采用“外径×线径”的标记方法，一般称为老国标； GB3452.1-82与GB3452.1-92基本相同，一般称为新国标，它规定的O型圈截面直径有1.8、2.65、3.55、5.3等，新国标采用国际惯例，O型圈采用“内径×线径”的标记方法。
选用O型圈时，首先应尽量选用新国标，线径2.65和3.55的使用最为普遍，在外径大于30左右，结构尺寸允许的情况下，尽量选用线径3.55的O型圈，以达到更大的压缩量和接触面积。
O型圈的材料主要有丁氰橡胶NBR和氟橡胶FKM，氟橡胶更适用于高温工况。
除材料之外，O型圈很重要的一个指标的是它的硬度，一般采用邵氏硬度来表示，从60到90左右不等，数值越大表示硬度越高。在同样压力下，硬度越高，防挤出（变形甚至撕裂）的能力就越强。因此，应选用硬度较高的O型圈。
然而，市场上常见的O型圈均为丁氰橡胶制成，邵氏硬度一般在70左右，难以满足相当一部分工况的要求。
O型圈的沟槽设计有相关的国家标准，主要分动密封、轴向静密封和径向静密封三种。法兰、箱盖等的O型圈采用轴向压紧更便于装配和保证密封性能。另外，我国国家标准中的沟槽尺寸标准已显落后，如国家标准中受内压的O型圈沟槽外径等于O型圈外径，而PARKER法兰接头的O型圈沟槽外径小于O型圈外径。设计时应适当参考国外标准。
有O型圈的密封面不得使用平面密封胶，可以在O型圈上涂少量黄油以使其不脱落。在维修时，应根据沟槽尺寸确定O型圈规格，并不是线径越粗越好。
（来源：西门子弗兰德减速机维护与保养）
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Hangzhou Jingzhou Bearing Co.,Ltd.
Address：Liangzhu Indystrial City Hangzhou
Service hotline：0571-88777186 88777665
Jiangsu Jingzhou Bearing Co., Ltd.
Address：No.19, Yulan Avenue, Xuyi Economic DevelopmentZone, Huai’an City, Jiangsu Province
Service hotline：0517-80817777
Website：www.jzbearing.com
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