一、引言浮环密封是石油化工用高压高速透平压缩机广为采用的一种新型密封型式。它的作用是防止转轴在通过壳体时产生泄漏,它的基本概念,是以轴与浮环之间的狭窄间隙中所产生的节流作用为基础的。浮环在间隙中的流体动力的作用下浮起,在正常情况下浮环与轴不会产生磨损。但是,由于在间隙中的流体流动的状态、稳定性和类型不同以及轴的振动等,实际上,浮环是一个在不稳定的流体动力、浮环质量的惯性力、浮环与隔离环间的方向变化的摩擦力作用下的复杂的运动系统。已有的计算方法假定浮环与轴线是固定的,这种计算方法虽然简单,但很不准确。因为它没有考虑在上述力的作用下浮环密封的动力学问题,因而根据现有的设计计算方法,不可能确定在轴与浮环不发生磨损的情况下,保 I. Introduction Floating ring seal is a new type of sealing widely used in high pressure and high speed turbo compressors for petrochemical industry. Its purpose is to prevent the shaft from leaking through the housing. Its basic concept is based on the throttling effect created by the narrow gap between the shaft and the floating ring. Floating ring floating in the gap under the action of the fluid power, under normal circumstances will not produce floating ring and shaft wear. However, due to the fluid flow in the gap of different states, different types of stability and shaft vibration, etc., in fact, the floating ring is an unstable hydrodynamic, floating ring mass inertia, floating ring and isolated ring The direction of change in the friction of the complex kinematic system. The existing calculation method assumes that the floating ring and the axis are fixed. Although this calculation method is simple, it is not accurate. Because it does not consider the dynamic problem of the floating ring seal under the force mentioned above, it is impossible to determine if the shaft and the floating ring do not wear under the existing design and calculation method