螺旋密封的密封能力及参数优化

建立了流体作层流运动条件下螺旋密封的封液能力模型.用CFD分析了压差力作用下密封介质受力分布和压差力作用下密封介质速度分布,并以此求出泵送流量和压差作用下产生沿螺旋槽的泄漏量和环形间隙产生的泄漏量.根据流量平衡理论求解出密封系数,并对螺旋密封结构的参数进行了参数优化,得出最佳螺旋密封结构参数,即当齿顶宽和齿槽宽比值为1,齿槽深和间隙比值为2.61,螺旋升角为15.6°时密封能力最强.为层流条件下螺旋密封结构参数的选择提供了参考.

Sealing Capability and Parameter Optimization of Screw Seal

A spiral sealed liquid capacity model was established for fluid motion under laminar flow conditions. Using the CFD method， the stress distribution of the seal material and sealing medium speed differential force distribution under the pressure gradient force were analyzed， and thus to obtain pumping rate and the annular lower leakage flow along the helical groove and differential pressure pumping gap leakage. According to the flow equilibrium theory， the sealing parameters were obtained and the spiral sealing structure parameters were optimized. The sealing capacity is strongest in the case of the ratio of tooth top width and space width， gullet depth and gap as well as the angle of helix are 1， 2.61 and 15.6°， respectively. Reference was provided for the selection of spiral seal structure parameters under laminar flow conditions.