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离心泵的密封是化工、炼油生产中的一个极为重要的问题,它不但关系到产品的产量、动力消耗,同时也关系到操作环境,工人的身体健康,需要从根本上研究解决。目前,离心泵的密封几乎全部采用纯属防御性的措施,从产生泄漏的根本原因这一角度来看,完全处于被动状态。以盘根密封的离心泵为例(图1),盘根室内侧的压力(P_内)是一个略低于但接近于泵出口压力(P_出),而又大于盘根室外侧压力(P_(大气_)的数值,它与P_(大气)之差为:△P=P_内-P_(大气)
Centrifugal pump sealing is a very important issue in the chemical and oil refining industries. It is not only related to product output and power consumption, but also to the operating environment and the health of workers, and needs to be fundamentally studied and solved. At present, almost all of the centrifugal pump seal using purely defensive measures, from the root cause of the leakage of this point of view, completely in a passive state. Taking a packing-sealed centrifugal pump as an example (Figure 1), the pressure inside the packing chamber (P_internal) is a little lower than but close to the pump outlet pressure (P_out) and greater than the pressure outside the packing chamber (Atmosphere_), the difference between it and P_ (atmosphere) is: ΔP = P_in-P_ (atmosphere)