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前言:英国流体力学研究协会(BHRA)和许多密封用户的调查一致表明,泵的70％—80％故障是由于机械密封失效所引起。某些故障与安装不够正确、制造质量较差和维护保养欠佳等因素有关。因为这些因素常常会缩短密封的使用寿命。尽管许多故障是由于密封端面的流膜破坏和过热所致,然而有一些密封产生中期失效,并无明显的原因。接触端面间流膜的稳定性,部分地或在某种情况下主要地取决于是否充分冷却和有效地排除端面周围的气体和固体。这些过程是由密封腔的流动状况所决定的。而流动状况是密封腔的几何形状和引液位置的函数。已经证明密
Preface: A survey by the British Association of Fluid Mechanics (BHRA) and many sealed users has consistently shown that 70% -80% of pump failures are due to mechanical seal failure. Some failures are related to inadequate installation, poor manufacturing quality and poor maintenance. Because of these factors will often shorten the seal life. Although many malfunctions are caused by the failure and overheating of the flow-through membranes on the sealing face, some of the seals experience medium-term failure for no apparent reason. The stability of the fluid film between the contacting end surfaces depends, in part or in some cases, mainly on whether the gases and solids surrounding the end face are sufficiently cooled and effectively excluded. These processes are determined by the flow of the sealed chamber. The flow condition is a function of the geometry of the sealed chamber and the position of the fluid. Has proved dense