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通过概述机械密封抽空失效的机理,建立了泵在抽空状态下机械密封动、静环的运动方程,经过龙格-库塔法数值求解得到机械密封端面状况随时间变化的理论曲线。采用传感器及计算机A/D数据采集板对机械密封在抽空状态下的端面状况做了动态测试,获取了在抽空状态下动静环的位移、端面压力和温度随时间变化的实验曲线。实验曲线与理论曲线的比较表明,机械密封在抽空状态下,存在振动、端面开启和静环被抽出等失效形式,泵密封腔压力和介质温度是影响抽空后端面状况的关键因素。
By summarizing the failure mechanism of mechanical seal evacuation, the equations of motion of the stationary and stationary rings of the mechanical seal under the pump down state are established. The theoretical curve of mechanical seal end surface condition over time is obtained through the Runge-Kutta numerical solution. The sensor and computer A / D data acquisition board were used to dynamically test the state of the end face of the mechanical seal in the evacuated state. The experimental curves of the displacement, the end face pressure and the temperature of the moving ring in the evacuated condition with time were obtained. The comparison between the experimental curve and the theoretical curve shows that the mechanical seal has the failure modes such as vibration, opening of the end face and withdrawing of the stationary ring under the evacuation condition. The pressure of the sealed chamber and the temperature of the medium are the key factors that affect the condition of the evacuated end face.