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机械密封是由至少一对垂直于旋转轴线的端面在流体压力和补偿机构弹力的作用及辅助密封的配合下保持贴合并相对滑动而构成防止流体泄露的装置。防止因机械密封问题而引起失效，必须全面检查影响失效的所有影响因素与影响机制。机械密封的实际密封效果不但与机械密封的自身性能有关，而且与其它零部件及密封辅助系统提供的条件有着紧密的关系，因此在设计密封装置时要为机械密封的使用提供一个良好的氛围。“,”Mechanical seal is by at least a pair of vertical on end surface of the axis of rotation in the fluid pressure and the elasticity of compensation organizations and the role of auxiliary seal with stay fit and relative sliding a device for preventing the leakage of fluid . In or-der to avoid the failure of mechanical seal , we must review all the in-fluencing factors and mechanism of the impact failure without missing . The use of mechanical seal of the actual sealing effect not only on me-chanical seals and its performance , and with other components and sealing auxiliary system provides the conditions has a close relationship , so in the design of the sealing device to seal mechanical provides a good condition .