波纹管机械密封多体多场热流固耦合性能分析

建立波纹管机械密封的波纹管-动环-流体膜-静环多体模型,对高温、高压、高速工况下的密封界面进行热流固耦合数值计算与分析,得到密封环在温度场、速度场、压力场等多场耦合影响下的应力和应变规律。在此基础上,分析主轴转速和流体压差对密封环端面温升和热应力变形的影响规律。结果表明:动静环的最大变形在端面的内径处,且变形量由内向外递减;动环端面的温升随密封压力和转轴旋转速度的增大近乎呈直线增加;动环的热应力变形程度随主轴转速和流体压差的增加而增加。

Analysis of Thermo fluid solid Coupling Performance on Multi body and Multi field of Bellows Mechanical Seal

The multi body model of bellows dynamic ring fluid film static ring of bellows mechanical seal was established. Numerical calculation and analysis of thermo fluid solid coupling on sealing interface were carried out under high temperature, high pressure and high speed, and the stress and strain law of the seal ring under the coupling effect of temperature velocity pressure field were obtained. On this basis, the influence laws of the spindle speed and fluid pressure difference on the temperature rise and thermal stress deformation of sealing ring end face were analyzed. The results show that the maximum deformation of the seal ring is at the inner diameter of the end face, and the deformation decreases from the inside to the outside; the temperature rise of the dynamic ring end face increases almost linearly with the increase of the sealing pressure and the rotation speed of the rotating shaft; the thermal deformation of the dynamic ring increases with the increase of the rotating shaft rotation speed and the sealing pressure.