碟簧对射流式冲击器密封影响研究

Effect of disk spring on the seal of liquid-jet hammer

以SC-86H高压高能射流式冲击器为研究对象,通过密封试验及ANSYS-LSDYNA有限元分析手段,研究了碟簧对用于端面密封的密封圈密封性能的影响。结果表明:在高压流体环境下,碰撞后碟簧变形会引起密封盖与射流元件密封配合面出现分离间隙,而较大的间隙张开量是导致密封圈失效的关键。间隙张开量与碟簧叠合数量负相关,当碟簧叠合数量为三片以下时,最大间隙张开量大于0.187 mm,密封圈损毁失效;当碟簧叠合数量为四片时,最大间隙张开量为0.086 mm,密封圈存在较高的失效风险;当碟簧叠合数量达到五片以上时,最大间隙张开量小于0.049 mm,可保证密封圈密封长期有效。此外,随着碟簧数量增加,碟簧中最大应力下降,三片碟簧叠合可满足碟簧的应力强度最低要求,考虑到疲劳及密封,碟簧数量应选择五片以上。

By sealing tests and simulations based on ANSYS-LSDYNA,the effect of disk springs on the seal performance of sealing rings in SC -86H liquid-jet hammer was investigated.The results show that the seperated gap between the sealing surfaces of sealed cap and fluidic amplifier is a key factor which causes the failure of sealing rings under high-pressure fluid environment.The negative correlation between the value of gap and the amount of superposed disk springs was presented.With no more than three disk springs,the sealing rings may be destroyed as the gap is over 0.187 mm.When the amount of disk springs is four,the gap may reach 0.086 mm and the sealing rings may fail after longtime work.In order to ensure that the sealing rings work safely,the amount of disk springs should be no less than five so that the value of gap can reduce to below 0.049 mm.It is also found that the maximum stress in disk springs would decrease with the increasing amount of disk springs,and five disk springs can meet the requirements of sealing and strength design simultaneously.