论文部分内容阅读
对于机械密封端面流体膜,许多研究人员做了大量的工作,试验证明了端面间存在一层流体膜,并且膜压包括流体静压力和流体动压力。普通机械密封的流体动压效应较小,一般来说端面流体膜压即指流体静压力。实际机械密封工作时总是伴有一定的泄漏,多数处于混合摩擦状态。由流体力学可知、端面间连续流动的流体膜的膜压连续变化,其变化规律不仅与流体的物理性质有关,而且与流体的状态有关,如图1所示。压力减少系数K由密封液的蒸汽压、比重等决定。一般采用表1内数值。
Many researchers have done a lot of work on the mechanical seal end-face fluid film. The test proves that there is a fluid film between the end faces, and the film pressure includes hydrostatic pressure and hydrodynamic pressure. Common mechanical seal hydrodynamic pressure effect is small, in general, the end of the fluid membrane pressure refers to the hydrostatic pressure. The actual mechanical seal is always accompanied by a certain degree of leakage, most in mixed friction state. The fluid mechanics shows that the film pressure of the continuous flowing fluid film continuously changes between the end faces, and its variation is not only related to the physical properties of the fluid but also related to the fluid state, as shown in FIG. 1. The pressure reduction factor K is determined by the vapor pressure, specific gravity, etc. of the sealing liquid. The general use of Table 1 values.