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2024-05-16
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作者：王伟华
机械密封的压缩量是设计机械密封时，按照弹簧的压力系数，密封端面的压比来确定的密封的压缩量。如果你已知密封生产厂家，那么，密封的压缩量已经确定，不需要再重新计算，按照生产厂家提供的数值设计相应的腔体，安装即可，如果是工况条件不确定，需要重新确定压缩量及压缩系数等。具体测量方法是，动环有弹簧座或弹簧定位端面起，到静环端面位置，测量出压缩量与自然状态的差值就是压缩量。
机械密封形式，可以设计为平衡性、非平衡机械密封，不同密封承受的压力是不同的，涉及弹簧因素，压缩量不太一样，如大弹簧的压缩量相对大一些，小弹簧结构的，压缩量小。单弹簧机械密封的压缩量为50%-70%，即机械密封压死后放开3-5mm，多弹簧（碟形弹簧）的压缩量为90%，即机械密封压死后放开1.5-2.5mm，但同时应综合考虑密封面的宽度、弹簧的力度及工作受力状态。
对于一般的单级泵来说，机封轴套上都有定位槽，根据机封动静环接触后自由状态及安装到位的距离差就是机封的压缩量。对于一般的多级泵，要先把轴的位置定住，再分别测量驱动侧和非驱动测机封动静环接触后自由状态及安装到位的距离差，就是机封的压缩量。
自由状态高度减去压死以后的高度，就是和，一般取中上为佳。 标有L1与L2两个尺寸，L1是指密封件的工作高度，L2是安装的位置尺寸。动环有弹簧座或弹簧定位端面起，到静环端面位置，测量出压缩量与自然状态的差值就是压缩量，注意静环有密封圈。 常用机械密封结构由静止环(静环)、旋转环(动环)、弹性元件弹簧座、紧定螺钉、旋转环辅助密封圈和静止环辅助密封圈等元件组成，防转销固定在压盖上以防止静止环转动。旋转环和静止环往往还可根据它们是否具有轴向补偿能力而称为补偿环或非补偿环。
来源：中天钢铁热电厂
（版权归原作者或机构所有）
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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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