密封结构参数对安全阀磁流体密封压力的影响

Influence of sealing structure parameters on the magnetic fluid sealing pressure of safety valves

为探讨安全阀磁流体密封性能与结构关键参数的关系,以安全阀磁流体密封装置作为研究对象,利用有限元分析软件计算出密封间隙内磁感应强度变化值,计算在不同密封结构关键参数下密封间隙内耐压值并对其进行分析,最终得到各参数之间的相互关系从而为提高密封能力提供指导。研究结果表明:当极齿齿槽宽度为3mm时,密封压力最大值在极齿宽度2mm处;当极齿宽度为3mm时,密封压力最大值在齿槽宽度2.5mm处;将矩形极齿改为单侧斜角极齿30°,密封压力会整体上升且最大值在极齿齿槽宽度3mm、极齿宽度1.5mm处;改变剩磁大小会影响磁感应强度但磁感应强度差值不变,对于密封压力最优值没有影响。这些规律为安全阀磁流体密封装置的设计提供了理论参考。

To explore the relationship between the magnetic fluid sealing performance of safety valves and the key parameters of the structure.Using a conventional magneto-fluidic seal as the research object,the variation of magnetic induction intensity within the seal gap is calculated using finite element analysis software.The pressure resistance in the seal gap is calculated and analyzed under different key parameters of the seal structure,and finally the interconnection between the parameters is obtained to provide guidance for improving the sealing capacity.The results show that the maximum value of sealing pressure is at 2 mm of tooth width when the width of tooth groove is 3 mm;the maximum value of sealing pressure is at 2.5 mm when the width of tooth is 3 mm;changing the rectangular tooth to 30°of unilateral beveled tooth will increase the overall sealing pressure and the maximum value of sealing pressure is at 3 mm of tooth groove width and 1.5 mm of tooth width;changing the size of remanent magnetism will affect the magnetic induction.While when the remanent magnetic strength is changed,the difference of magnetic induction strength remains unchanged,the change of remanent magnetic strength has no effect on the optimal value of sealing pressure.These laws provide a theoretical reference for the design of magnetic fluid sealing devices for safety valves.